Properties of Matter

wardsci.com 800-962-2660 Bytownite (Ca,Na) Al (Al,Si) Si2O8 (An70-90) (Feldspar) Crystallography: Triclinic; 1. Crystals usually tabular parallel to {010}; twinning frequent as in albite. Commonly as irregular grains and cleavable masses. Physical...

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+ward’ssciencewardsci.com800-962-2660 Goethite Fe+3 O (OH) (See also Limonite) Crystallography: Orthorhombic; 2/m2/m2/m. Acicular or rarely in distinct prismatic, vertically striated crystals. Also massive, reniform, stalactitic, or in radiating f...

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Almandine Fe3+2 Al2 (SiO4)3 (Garnet Group) Crystallography: Isometric; 4/m32/m. common forms are dodecahedron and trapezohedron. Also massive, granular. Physical Properties: Cleavage: Not prominent; {110} parting sometimes distinct. Fracture subco...

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wardsci.com 800-962-2660 Forsterite Mg2 Si O4 (Olivine Group) Crystallography: Orthorhombic; 2/m2/m2/m. Rarely in small equidimensional or tabular crystals; usually in granular masses and as rounded grains. Physical Properties: Cleavage: {101} ind...

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+ward’ssciencewardsci.com800-962-2660 Schorl (Tourmaline Group) Na Fe3+2 Al6 (BO3)3 Si6 O18 (OH)4 Crystallography: Hexagonal -R; 3m. Usually in prismatic crystals with rounded triangular cross- section due to prominent trigonal prism and subordina...

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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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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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+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 Ilmenite Fe+2 Ti O3 Crystallography: Hexagonal-R; 3. Crystals usually thick tabular with prominent basal planes and small rhombohedral truncations. Commonly in thin plates, massive or compact; also in grains o...

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wardsci.com 800-962-2660 Sphalerite (Zn,Fe) S Crystallography: Isometric; 43m. Crystals usually tetrahedral or dodecahedral and often distorted and complex; rough, curved faces common. Usually in cleavable masses, coarse to fine granular. Physical...

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+ward’ssciencewardsci.com800-962-2660 Chalcocite Cu2S Crystallography: Orthorhombic; 2/m2/m2/m (below 105°C); above 105°C, hexagonal. Crystals uncommon, usually small and tabular with hexagonal outline. More often fine-grained and massive. Physica...

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+ward’ssciencewardsci.com800-962-2660 Galena Pb S Crystallography: Isometric; 4/m32/m. Commonly cubic, sometimes truncated by the octahedron; rarely decahedral and trisoctahedral. Also massive, granular. Physical Properties: Cleavage: {001} perfec...

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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 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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+ward’ssciencewardsci.com800-962-2660 Phlogopite KMg3 Si3 AlO10 (F, OH)2 (Mica Group) Crystallography: Monoclinic; 2/m. Usually in six-sided plates or in tapering prismatic crystals; also in foliated masses. Physical Properties: Cleavage: {001} pe...

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Working with Algae and Cyanobacteria © 2021 Ward’ s Science. All rights reserved. Rev. 2021 https://www.wardsci.com/store/ Page 2 Working with Algae and Cyanobacteria Diatoms Bacillariophytes, which occur in fresh water, salt water, and terrestria...

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