clay minerals

+ward’ssciencewardsci.com800-962-2660 Muscovite K Al2 (Si3 Al) O10 (OH, F)2 (Mica Group) Crystallography: Monoclinic; 2/m. Distinct crystals rare; usually tabular with prominent {001}. Usually in lamellar masses or small flakes. Foliated in large ...

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wardsci.com 800-962-2660 Quartz (variety Rose) Si O2 Crystallography: Hexagonal -R; 32 (low quartz). Hexagonal; 622 (high quartz). Crystals not common. Usually massive, coarsely crystalline. Physical Properties: Cleavage: Generally none; occasiona...

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+ward’ssciencewardsci.com800-962-2660 Magnetite Fe+2Fe2+3O4 (Spinel Group) Crystallography: Isometric; 4/m32/m. Frequently in octahedral crystals; rarely dodecahedral. Commonly coarse-to fine-grained granular, massive. Physical Properties: Cleavag...

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wardsci.com 800-962-2660 Microcline K Al Si3 O8 (Feldspar Group) Crystallography: Triclinic; 1. Crystal habit similar to orthoclase. Usually polysynthetically twinned on both the albite and pericline laws, giving characteristic grating or gridiron...

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wardsci.com 800-962-2660 Chromite Fe+2 Cr2 O4 (Spinel Group) Crystallography: Isometric; 4/m32/m. Habit octahedral but crystals small and rare; most often granular to compact; massive. Physical Properties: Cleavage: None. Fracture uneven; brittle....

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wardsci.com 800-962-2660 Talc Mg3 Si4 O10 (OH)2 Crystallography: Monoclinic; 2/m. Rarely in crystals; more often in foliated masses or compact fine- grained aggregates. Compact and massive varieties known as steatite or soapstone. Physical Propert...

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wardsci.com 800-962-2660 Marble Type: Metamorphic; regional and contact. Texture/Appearance: Fine to coarse-grained; granoblastic to saccharoidal. May appear patched or with streaks or banding that is deformed. Color: Variable, commonly white, pin...

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+ward’ssciencewardsci.com800-962-2660 Albite NaAlSi3O8 (An0-10) (Feldspar Group) (see also Plagioclase) Crystallography: Triclinic; 1. Crystals commonly tabular parallel to {010}; sometimes elongated on b. Twinning and striations common. Often as ...

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+ward’ssciencewardsci.com800-962-2660 Actinolite Ca2 (Mg, Fe+2)5 Si8O22(OH)2 (Amphibole Group) Crystallography: Monoclinic; 2/m. Crystals usually prismatic; columnar or fibrous. Also massive or granular. Physical Properties: Cleavage: {110} perfec...

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+ward’ssciencewardsci.com800-962-2660 Halite NaCl Crystallography: Isometric; 4/m32/m. Cubic habit; other forms very rare. Also massive, granular to compact. Physical Properties: Cleavage: {001} perfect. Fracture conchoidal; rather brittle. Hardne...

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+ward’ssciencewardsci.com800-962-2660 Quartz (variety Flint) Si O2 Crystallography: Hexagonal -R; 32 (low-quartz). Hexagonal; 622 (high quartz). cryptocrystalline; massive granular. Physical Properties: Cleavage: Generally none; occasional indisti...

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+ward’ssciencewardsci.com800-962-2660 Anorthosite Type: Igneous; intrusive. Texture/Appearance: Medium to coarse-grained, equigranular with elongated tabular plagioclase. Color: Dark gray to bluish-gray, sometimes lighter shades. Mineralogy/Chemis...

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+ward’ssciencewardsci.com800-962-2660 Apatite Ca5(PO4)3(F,Cl,OH) Crystallography: Hexagonal; 6/m. Commonly occurs in crystals of long prismatic habit; also in mas- sive to compact masses. Physical Properties: Cleavage: {0001} poor. Fracture concho...

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wardsci.com 800-962-2660 Pyrrhotite Fe1-xS (x = 0 - 0.17) Crystallography: Monoclinic; 2/m (below about 250°C). Hexagonal; 6/m3/m2/m for high tempera- ture forms. Crystals rare, usually tabular to platy on {0001}. Also massive, granular. Physical ...

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wardsci.com 800-962-2660 Gypsum CaSO4 • 2H2O Crystallography: Monoclinic; 2/m. Crystals commonly simple in habit; tabular on {010}; diamond- shaped, with edges beveled by {120} and {111}. Twinning common on {100}. Also granular, massive. Physical ...

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+ward’ssciencewardsci.com800-962-2660 Quartzite Type: Metamorphic; regional. Texture/Appearance: Massive, with generally small grain size; sometimes saccharoidal. Grain size (sand size, 1/16-2mm) dependent on original detritus. Generally non-folia...

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