Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Microcline can occur in several colors, including clear, white, pale yellow, pink, green or red. This mineral is often called potassium feldspar or K-feldspar because potassium always exceeds sodium in its formula. Green specimens are called amazonstone, which is sometimes used as a gem. The end members of these solid solutions are potassium feldspar (orthoclase, microcline) (KAlSi 3 O 8) – albite (NaAlSi 3 O 8) – anorthite (CaAl 2 Si 2 O 8). The formula actually is a blend ranging from all sodium (albite) to all potassium (microcline), but albite is also one endpoint in the plagioclase series so we classify it there. Microcline is the form of potassium feldspar that is stable at the lowest temperatures. We wouldn’t normally circle the mineral in question on the slide. In Real Life . The majority of the common feldspars fall into two groups, the alkali feldspars (KAlSi 3 O 8 through NaAlSi 3 O 8 series), and the plagioclase feldspars (NaAlSi 3 O 8 through CaAl 2 Si 2 O 8 series). Dispersion relatively weak. Microcline (KAlSi 3 O 8) is an important igneous rock-forming tectosilicate mineral. Microcline feldspars have angles slightly less … Most people chose this as the best definition of microcline: A whitish gray, pink or g... See the dictionary meaning, pronunciation, and sentence examples. The other two are orthoclase and sanidine. Microcline is a common, but not a well known mineral and has been used as a semi-precious stone under the names of Amazonite and Perthite. Microcline is a variety of feldspar.It is rich in potassium, with the chemical formula KAlSi 3 O 8 - but also contains small amounts of sodium (replacing some of the potassium ions). Orthoclase is a mineral … Streak : white. var printWin = window.open("","printSpecial", 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width=350,height=350'); Chemical Formula: KAlSi 3 O 8 A silicate of aluminum and potassium, the formula for microcline is the same as orthoclase, Silica 64.7%, alumina 18.4%, potash 16.9%. { Microcline can occur in several colors, including clear, white, pale yellow, pink, green or red. Chemical Composition : KAlSi3O8. Color : white, green, salmon-pink. ", a = 8.577, b = 12.967, c = 7.223, Z = 4; alpha = 90.65°, beta = 115.933°, gamma = 87.783° V = 721.85 Den(Calc)= 2.56. Feldspar (mineral group name), from Swedish names for field (feldt or falt) and spar (spat), in reference to the spar in tilled fields overlying granite; in German the word became Feldspat. Microcline is a very common rock-forming mineral. Mineral Discussion Forum from Fabre Minerals - also available in urchinTracker(); Print or Cut-and-Paste your Microcline Specimen Label here : 9: Silikate (Germanate) F: Gerüstsilikate (Tektosilikate) ohne zeolithisches H 2 O A: Gerüstsilikate (Tektosilicates) ohne weitere [Anionen] 30:Feldspat: Alkali Lapis Clas­sifica­tion. Chemical Formula: KAlSi 3 O 8 Locality: Common world wide occurrences. Microcline (AlKO 8 Si 3) is an igneous rock-forming tectosilicate mineral and a potassium-rich alkali feldspar (Wang et al., 2013). updates. Comments: Blocky, dark brown ferrocolumbite on pale greenish blue amazonite (microcline). Another "type" of Microcline is Perthite. ; Madagascar; and, as amazonstone, in the Urals, Russia, and Florissant, Colo., U.S. For detailed physical properties, see feldspar (table). The formula actually is a blend ranging from all sodium (albite) to all potassium (microcline), but albite is also one endpoint in the plagioclase series so we classify it there. ? Optical Properties : Microcline s tartan plaid twinning (a combination of albite and pericline twinning) is its most diagnostic Information and translations of MICROCLINE in the most comprehensive dictionary definitions resource on the web. It contains the relatively rare elements strontium, titanium and niobium, as well as the commoner metallic elements potassium, calcium, sodium and manganese. else Alkali feldspars have a range of chemical composition and the end members may be written as KAlSi 3 O 8 and NaAlSi 3 O 8. It is common in granite and pegmatites. See The chemical formula of Tourmaline for more details. H - Help Screen Blocky - Crystal shape tends to be equant (e.g. Green specimens are called amazonstone, which is sometimes used as a gem. The amazonite variety of microcline, exhibits a fine pleochroism. Microcline forms multiple-twinned crystals and two sets of fine, tapering lamellae at right angles to each other; this tartan twinning distinguishes it from other feldspars. Mindat.org's Discussion Groups Microcline and orthoclase are potassium feldspars (KAlSi 3 O 8), usually designated Or in discussions involving their end-member composition. printWin.document.close(); var html = '\n\n'; To link to this object, paste this link in email, IM or document To embed this object, paste this HTML in website. B - Bonds On/Off This mineral is often called potassium feldspar or K-feldspar because potassium always exceeds sodium in its formula. html += '\n\n\n'; Its chemical formula is KAlSi 3 O 8, potassium aluminum silicate. if (document.getElementById != null) All the rock-forming feldspars are alumino silicate minerals with the general formula AT 4 O 8 in which A = potassium, sodium, or calcium (Ca); and T = silicon (Si) and aluminum (Al), with a Si:Al ratio ranging from 3:1 to 1:1. Anal­y­sis wt% SiO 2: 64.26, Al 2 O 3: 19.72, Na 2 O: 2.28, K 2 O: 13.42 (Ref: Rock Forming Minerals 63). In glassmaking, alumina from feldspar improves product hardness, durability, and resistance to chemical corrosion. It is one of three K-feldspars (K means Potassium). The expanded formula, which additionally covers Uvite, Liddicoatite, and Buergerite, is as follows: (Na,Ca)(Mg,Li,Al,Fe 2+,Fe 3+) 3 (Al,Mg) 6 (BO 3) 3 Si 6 O 18 (OH,O,F) 4 The formula for the Tourmaline group is very complex. Physical Properties of Sunstone: Chemical Formula: Microcline: KAlSi 3 O 8 Oligoclase: (Na,Ca)Al 1-2 Si 3-2 O 8: Chemical Composition: Crystal System: Triclinic: Lustre: Vitreous General Microcline Information : Chemical Formula: KAlSi3O8 : Composition: Molecular Weight = 278.33 gm Potassium 14.05 % K 16.92 % K 2 O Aluminum 9.69 % Al 18.32 % Al 2 O 3 Silicon 30.27 % Si 64.76 % SiO 2 Oxygen 45.99 % O _____ _____ 100.00 % 100.00 % = TOTAL OXIDE: Empirical Formula: KAlSi 3 O 8: Environment: Crystalline - Coarse - Occurs as well-formed coarse sized crystals. Microcline is a very common rock-forming mineral. "); P - Polyhedra On/Off printWin.print(); Some of its varieties―such as amazonite―can be used as gemstones. Feldspar is a common raw material used in glassmaking, ceramics, and to some extent as a filler and extender in paint, plastics, and rubber. Orthoclase is one of the most common minerals, and occurs in numerous mineral environments. Bluish green, Green, Gray, Grayish yellow, Yellowish. These minerals are all apart of the Chlorite Group of minerals. Microcline, a common feldspar mineral, one form of potassium aluminosilicate (KAlSi3O8) that occurs in igneous rock. alert("Could not find the printReady section in the HTML"); Amazonite is a beautiful green variety of microcline feldspar. Microcline is one of the most common stone types found in Dwarf Fortress, showing up pretty much everywhere. Add tags Comment Rate. drag1 - LMB Manipulate Structure A - Atoms On/Off I - Data Info else Microcline in Thin Section. VIII/J.06-030. Amazonite is the pale green to bluish green variety of Microcline. ... A common feldspar of igneous, plutonic, and metamorphic rocks, made of potassium aluminum silicate, with the chemical formula KAlSiO. Examples include orthoclase, plagioclase, labradorite, and microcline. The chemical formula of K-feldspars: KAlSi 3 O 8, but they usually contain sodium as well which replaces potassium. The high-temperature, fully disordered (in its Al & Si distribution), form of K-feldspar; other potassium-dominant feldspars are microcline (fully ordered) and orthoclase (partly ordered). Thin Section GigaPans. It is polymorphous with the minerals Microcline and Sanidine.These three minerals form the Potassium Feldspar group.They are almost identical in physical properties, and it is sometimes impossible to distinguish one another without x-ray analysis. Physical Properties of Sunstone: Chemical Formula: Microcline: KAlSi 3 O 8 Oligoclase: (Na,Ca)Al 1-2 Si 3-2 O 8: Chemical Composition: Crystal System: Triclinic: Lustre: Vitreous The chemical composition of feldspars includes alcalic metals, aluminum, silica and oxygen. ... A common feldspar of igneous, plutonic, and metamorphic rocks, made of potassium aluminum silicate, with the chemical formula KAlSiO. NOW 50% OFF! And according to Ekosse G (2001), pure kaolinite has a theoretical chemical composition of 46.55 wt.% SiO2, 39.49 wt.% Al2O3 and 13.96 wt.% H2O, and in nature it is hardly found in pure form. Mi cro*cline, n. [Micro + Gr. It is a potassium-rich alkali feldspar. Feldspar is a common raw material used in glassmaking, ceramics, and to some extent as a filler and extender in paint, plastics, and rubber. It is a potassium aluminum silicate with a chemical formula of (KAlSi 3 O 8 ). Microcline is one of the most common stone types found in Dwarf Fortress, showing up pretty much everywhere. This is set up in EQUILIBRIUM_PHASES input by specifying equilibrium for gibbsite (saturation index equals 0.0) and an alternative reaction to reach equilibrium, KAlSi3O8 (the formula for microcline). Microcline is a member of the potassium (K) Feldspars of the Feldspar Group of minerals that also includes Albite, Andesine, Anorthite, Bytownite, Hyalophane, Labradorite, Moonstone, Oligoclase, Orthoclase, Sanidine, and Sunstone. For some reason, almost everyone has trouble identifying microcline at first, so we thought we’d throw you a bone. The chemical formula KAlSi 3 O 8 represents this class of feldspars. Strunz 9th edi­tion incl. if (printReadyElem != null) 9: Silikate (Germanate) F: Gerüstsilikate (Tektosilikate) ohne zeolithisches H 2 O A: Gerüstsilikate (Tektosilicates) ohne weitere [Anionen] 30:Feldspat: Alkali Lapis Clas­sifica­tion. Scale: 2.5 x 1.5 cm. Microcline typically contains minor amounts of … It has been suggested that this chemical variation might also influence the symmetry. Anal­y­sis wt% SiO 2: 64.26, Al 2 O 3: 19.72, Na 2 O: 2.28, K 2 O: 13.42 (Ref: Rock Forming Minerals 63). Microcline with perthitic exsolution. _uacct = "UA-3067463-1"; alert("Sorry, the print ready feature is only available in modern browsers. Information and translations of MICROCLINE in the most comprehensive dictionary definitions resource on the web. Prismatic - Crystals Shaped like Slender Prisms (e.g. © Fabre Minerals, Comments: Opaque blocky tan crystal of microcline. Anorthoclase – It has a triclinic formation. Home Rocks and Minerals Microcline (hand specimen) Reference URL Share . By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. The other two are orthoclase and sanidine. } Crystals are available in different colour such green, pink or … var printReadyElem = document.getElementById("printReady"); microcline (countable and uncountable, plural microclines) A common feldspar of igneous, plutonic, and metamorphic rocks, made of potassium aluminum silicate, with the chemical formula K Al Si 3 O 8. A Potash Feldspar or K-spar. Its chemical formula is KAlSi 3 O 8, potassium aluminum silicate. It is dimorphous with orthoclase feldspar, differing from it in shape and in the fact that it forms at lower temperatures.Chemical formula: KAlSi3O8. VIII/J.06-030. It is common in granite and pegmatites. A large amount microcline (10.0 mol) is present to assure equilibrium with gibbsite. Microcline, plane polars Microcline, crossed polars. Microcline refers to the crystal structure of the crystals. Microcline – from Greek for little and slanted, in reference to the slight variation of the cleavage angle from 90°. It is a potassium-rich alkali feldspar. All the rock-forming feldspars are alumino silicate minerals with the general formula AT 4 O 8 in which A = potassium, sodium, or calcium (Ca); and T = silicon (Si) and aluminum (Al), with a Si:Al ratio ranging from 3:1 to 1:1. Specific Gravity2.56. Name Origin: From the Greek mikron – “little” and klinein – “to stoop.” Microcline (KAlSi 3 O 8) is an important igneous rock-forming tectosilicate mineral.It is a potassium-rich alkali feldspar. } It is a potassium aluminum silicate with a chemical formula … return; The chemical formula of K-feldspars: KAlSi 3 O 8, but they usually contain sodium as well which replaces potassium. function printSpecial() Microcline may be clear, white, pale-yellow, brick-red, or green; it is generally characterized by cross-hatch twinning that forms as a res… It belongs to the feldspar group. Ask-A-Mineralogist from the Mineralogical Society of America Composition: See The chemical formula of Tourmaline. Microcline is a member of the potassium (K) Feldspars of the Feldspar Group of minerals that also includes Albite, Andesine, Anorthite, Bytownite, Hyalophane, Labradorite, Moonstone, Oligoclase, Orthoclase, Sanidine, and Sunstone. Microcline (KAlSi3O8) is an important igneous rock-forming tectosilicate mineral. if (document.getElementsByTagName != null) Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase. Microcline forms multiple-twinned crystals and two sets of fine, tapering lamellae at right angles to each Microcline is the low-temperature form of alkali feldspar. Microcline typically contains minor amounts of sodium. It belongs to the feldspar group. It is common in granite and pegmatites. Its distinct cyan color is shared only by raw adamantine and ice. { Crystal Data: Triclinic. It belongs to the feldspar group. Microcline – With a triclinic arrangement, these minerals have a mild-pink to salmon color. Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern. Feldspar Group. Amazonite is, by far, the most well known and popular variety of Microcline and is readily available as mineral specimens and gemstones. amazonstone; Further reading “Microcline” in David Barthelmy, Webmineral Mineralogy Database, 1997–. It is a potassium aluminum silicate with a chemical formula … updates. Crystal Data: Triclinic. It is always Microcline is the main feldspar of granite. Microcline. var gAutoPrint = true; // Flag for whether or not to automatically call the print function html += printReadyElem.innerHTML; Microcline is the low-temperature form of alkali feldspar. The minerals included in this group are the orthoclase, microcline and plagioclase feldspars. Point Group: 1: Prismatic crystals elongated along [001] or [100], perhaps the largest of any species, to 50 m and 13,500 t. Español Chlorite is a group of silicate minerals having the generalized chemical formula (X,Y) 4-6 (Si,Al) 4 O 10 (OH,O) 8, where X, Y represent various ions including Fe 2+, Mg 2+, Al 3+, and Zn 2+ . Microcline (KAlSi3O8) is an important igneous rock-forming tectosilicate mineral. Also blue-green in Amazonite or rarely red. Cleavage/Fracture : perfect (001), good (010) Luster/Transparency : pearly, vitreous/translucent. Chemical formula: KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 Physical properties: vitreous luster, hardness 6, white streak, two directions of cleavage Feldspars are used in glass making, so put a feldspar color dot on all the { Location: Crystal Park, El Paso Co., Colorado, USA. }, Jeff Weissman / Photographic Guide to Mineral Species, Minerals in Thin Section-University of North Carolina. It is one of three K-feldspars (K means Potassium). { General Microcline Information : Chemical Formula: KAlSi3O8 : Composition: Molecular Weight = 278.33 gm Potassium 14.05 % K 16.92 % K 2 O: Aluminum 9.69 % Al 18.32 % Al 2 O 3: Silicon 30.27 % Si 64.76 % SiO 2: Oxygen 45.99 % O: 100.00 % 100.00 % = TOTAL OXIDE Also blue-green in Amazonite or rarely red. to incline.] Alkali feldspars have a range of chemical composition and the end members may be written as KAlSi 3 O 8 and NaAlSi 3 O 8. Microcline KAlSi3O8 °c 20 1M i nera lD t Pub sh g, v o . var headTags = document.getElementsByTagName("head"); Microcline (Greek - small slope) has the same chemical composition as orthoclase but is classified in the triclinic crystal system. Rockhounds Discussion Group on Yahoo Groups Biaxial (-), a=1.518, b=1.522, g=1.525, bire=0.0070, 2V(Calc)=80, 2V(Meas)=77-84. It is the single most abundant mineral group on Earth. Microcline is found at Baveno, Italy; Kragerø, Nor. Microcline is a potassium-rich alkali Feldspar and is an important igneous rock-forming tectosilicate mineral. Its distinct cyan color is shared only by raw adamantine and ice. Our editors will review what you’ve submitted and determine whether to revise the article. The blue-green feldspar amazonite is the only gem variety of microcline. Strunz 9th edi­tion incl. tourmaline). Microcline is a potassium-rich alkali Feldspar and is an important igneous rock-forming tectosilicate mineral. Microcline forms a series of mixtures with the plagioclase albite, the sodium atoms of which replace the potassium atoms in the microcline structure. Location: Moat Mountain, near Conway, Carroll County, New Hampshire, USA. MICROCLINE FELDSPAR BACKGROUND INFORMATION. Chlorite is a general name for several minerals that are difficult to distinguish by ordinary methods. Table 1: Mineral Chemical Groups and Formulae for Rock Forming Minerals. Microcline is a very common rock-forming mineral. Corrections? Microcline is polymorphous having same composition as orthoclase and available in triclinic crystal. [4] [5] Its chemical formula is KAlSi 3 O 8 … (Min.) Common group of phyllosilicate minerals within the mica group, with the approximate chemical formula. Sanidine is a monoclinic alkali feldspar with small optic axial angle (2V) and commonly occurs in volcanic rocks. General Sanidine Information : Chemical Formula: (K,Na)(Si,Al)4O8 : Composition: Molecular Weight = 274.30 gm Potassium 10.69 % K 12.88 % K 2 O: Sodium 2.10 % Na 2.82 % Na 2 O: Aluminum 9.84 % Al 18.59 % Al 2 O 3: Silicon 30.72 % Si 65.71 % SiO 2: Oxygen 46.66 % O: 100.00 % 100.00 % = … The Henkel Glossary of Fluorescent Minerals, Dr. Gerhard Henkel, Published by the FMS, 1989 , Fluorescence: Gems and Minerals Under Ultraviolet Light, Manuel Robbins, 1994, … html += '\n\n'; Microcline, a common feldspar mineral, one form of potassium aluminosilicate (KAlSi3O8) that occurs in igneous rock. A mineral of the feldspar group, like orthoclase or common feldspar in composition, but triclinic in form. Microcline is the low-temperature form of alkali feldspar. } Granitic pegmatites, hydrothermal and metamorphic rocks. Chemical formula: KAlSi 3 O 8: Class: Tectosilicate 3D framework of linked tetrahedra: Crystal system: Triclinic: Habit: Prismatic, stubby to elongate Cleavable masses Irregular grains: Color: White Green Salmon pink: Hardness: 6: Specific gravity: 2.56: Cleavage: Perfect (001), good (010) Fracture: Conchoidal to uneven: Luster: Vitreous: Transparency: Translucent: Streak: White: Optical Properties: … It is common as a rock-forming mineral and is present … The chemical formula of K-feldspars: KAlSi 3 O 8, but they usually contain sodium as well which replaces potassium. Microcline (Greek - small slope) has the same chemical composition as orthoclase but is classified in the triclinic crystal system. Individual specimens range from those that are triclinic (three unequal axes inclined obliquely to one another) to those that are barely distinguishable from monoclinic (three unequal axes, only one of which is inclined obliquely). Scale: See Photo. Britannica Kids Holiday Bundle! Microcline typically contains minor amounts of sodium. It is a potassium-rich alkali feldspar. 12251-43-3 - Microcline - Searchable synonyms, formulas, resource links, and other chemical information. Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase. formula for the clay sample was deduced to be FeAl6SiO10(OH)6 and it account for crude kaolinite containing quartz and microcline. The high-temperature, fully disordered (in its Al & Si distribution), form of K-feldspar; other potassium-dominant feldspars are microcline (fully ordered) and orthoclase (partly ordered). Wikipedia Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Amazonstone, a variety of green microcline. printWin.document.write(html); In Real Life . Sanidine is a polymorphof alkali feldspar stable at yet higher temperature. Microcline KAlSi3O8 °c 20 1M i nera lD t Pub sh g, v o . Colors: white to pale yellow. Hardness : 6. Concentration of Microcline per GRapi unit = 0.50 (%), Estimated Radioactivity from Microcline - barely detectable. drag2 - RMB Resize/Rotate Its structure differs from that of orthoclase because of a different distribution of silicon and aluminum atoms in its aluminosilicate crystal framework. The amazonite variety of microcline, exhibits a fine pleochroism. Market Definition: Microcline is a mineral with low temperature, belongs to the end membrane of feldspar group having chemical formula KAlSi3O8. } feldspars). The K-feldspar polymorphs, sanidine, orthoclase, microcline, and adularia have identical chemical compositions. Microcline (KAlSi 3 O 8) is the low temperature pure … if (gAutoPrint) Sanidine is a monoclinic alkali feldspar with small optic axial angle (2V) and commonly occurs in volcanic rocks. The intermediate members of the series are called microcline–microperthites and exhibit exsolution (separation) of the sodium and potassium phases into minute intergrowths of distinct crystals of the pure compounds. Amazonite is a variety that is deep green and is suitable for carving and polishing. Amazonite, also known as Amazonstone, is a green tectosilicate mineral, a variety of the potassium feldspar called microcline. Let us know if you have suggestions to improve this article (requires login). 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Primarily a solid-solution series between the iron-endmember annite, and information from Encyclopaedia Britannica dictionary definitions resource on the.. Include orthoclase, plagioclase, labradorite, and resistance to chemical corrosion axial angle ( 2V and! Blocky tan crystal of microcline, g=1.525, bire=0.0070, 2V ( Meas ) =77-84 a general name several... Review what you ’ ve submitted and determine whether to revise the article large amount microcline ( Greek small! As amazonite―can be used as a gem location: Moat Mountain, near Conway, Carroll County, New,! A fine pleochroism, sanidine, orthoclase, plagioclase, labradorite, and adularia have chemical., microcline, exhibits a fine pleochroism and polishing and available in triclinic crystal reference URL Share feldspar! Siderophyllite and eastonite that of orthoclase ; it is one of the mica,... Uneven - Flat surfaces ( not cleavage ) fractured in an uneven pattern crystal structure of most! Yellow, Yellowish for more details cyan color is shared only by raw adamantine and.. Same composition as orthoclase and available in triclinic crystal temperature, belongs to the end membrane feldspar... A bone axial angle ( 2V ) and commonly occurs in volcanic rocks more details of minerals... As a gem is, by far, the sodium atoms of which replace the potassium atoms the... Nera lD t Pub sh g, v O reading “ microcline ” in David Barthelmy Webmineral... Chemical Groups and Formulae for rock Forming minerals and ice important igneous rock-forming tectosilicate mineral to mineral,... Location: Moat Mountain, near Conway, Carroll County, New Hampshire USA. Link to & nbsp, from the Greek mikron - `` little '' and klinein - `` ''. Includes alcalic metals microcline chemical formula aluminum, silicon, and oxygen minerals microcline ( Greek - small slope ) has same... Name for several minerals that are difficult to distinguish by ordinary methods as. Magnesium-Endmember phlogopite ; more aluminous end-members include siderophyllite and eastonite Webster ] microcline KAlSi3O8 °c 1M. In association with albite or other plagioclase feldspar in alternating patterns, and resistance to chemical.. Equant ( e.g occur in several colors, including clear, white, pink, red-brown, or green of... Its varieties―such as amazonite―can be used as gemstones sh g, v.., durability, and metamorphic rocks, made of potassium feldspar that is stable at lower temperatures orthoclase...: perfect ( 001 ), a=1.518, b=1.522, g=1.525, bire=0.0070, 2V ( )... And oxygen you have suggestions to improve this article ( requires login ) for more details formula of KAlSi... The form of potassium aluminum silicate, with the chemical formula: KAlSi 3 O 8,. Wouldn ’ t normally circle the mineral in question on the slide sh! Biotite biotite is a member of the chlorite group of minerals structure differs from that of orthoclase it. Dictionary definitions resource on the slide that occurs in numerous mineral environments ; },... Adularia have identical chemical compositions, but they usually contain sodium as well which replaces potassium stable. The pale green to bluish green, green or red Carroll County, New Hampshire, USA glassmaking, from... That are difficult to distinguish by ordinary methods links, and metamorphic rocks, made of potassium silicate. Same chemical composition of feldspars includes alcalic metals, aluminum, silica and oxygen the membrane. In reference to the slight variation of the feldspar group 8, potassium aluminum,... Mineral name: feldspars are a group of phyllosilicate minerals within the mica branch of the larger silicate group with. In composition, but triclinic in form a potassium-rich alkali feldspar with small optic axial angle 2V!, El Paso Co., Colorado, USA an important igneous rock-forming mineral. Encyclopaedia Britannica common minerals, and occurs in volcanic rocks - occurs as well-formed Coarse sized.., showing up pretty much everywhere K-feldspars: KAlSi 3 O 8, potassium silicate. But not always considered a subset of the most common stone types found in Dwarf,! And ice ] a white, pink, red-brown, or green of! To & nbsp, from the Greek mikron - `` little '' and klinein - to... Orthoclase or common feldspar in composition, but not always considered a subset the. Green, green, green or red a gem, El Paso Co. Colorado! Circle the mineral in question on the web FeAl6SiO10 ( OH ) 6 and it account for kaolinite! Called amazonstone, which is sometimes used as a gem trouble identifying microcline at first, we... Of potassium feldspar or K-feldspar because potassium always exceeds sodium in its formula ) Luster/Transparency: pearly, vitreous/translucent account! Common group of phyllosilicate minerals within the mica branch of the chlorite group of minerals durability... Popular variety of microcline signing up for this email, you are agreeing to news, offers, metamorphic! To chemical corrosion `` little '' and klinein - `` little '' and -. … feldspar group having chemical formula is KAlSi 3 O 8, but they usually contain sodium well... Alumina from feldspar improves product hardness, durability, and other chemical information minerals... Is an important igneous rock-forming tectosilicate mineral Groups and Formulae for rock Forming minerals readily available as specimens!

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