You Searched For: Minerals and Rocks Earth Science Lab Activities
30 results were found
Schorl
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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...
Staurolite
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Staurolite (Fe+2, Mg, Zn)2 Al9 (Si, Al)4 O22 (OH)2 Crystallography:
Monoclinic (pseudo-orthorhombic); 2/m. Crystals prismatic with common forms {110}, {001}, and {101}. Cruciform twins very common (at nearly 9...
Cinnabar
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Cinnabar HgS Crystallography:
Hexagonal-R; 32 (low temperature form). Crystals usually rhombohedral, often in penetration twins. Commonly fine granular, massive; also earthy.
Physical Properties: Cleavage: {10...
Bauxite
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Bauxite Al (OH)3/AlO • OH Crystallography:
A mixture; often pisolitic in round concretionary grains, and also earthy, massive. Physical Properties:
Cleavage: None; uneven fracture. Hardness: 1.0-3.0. Specific ...
Corundum
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Corundum Al2O3 Crystallography:
Hexagonal-R; 32/m. Crystals commonly tabular on {0001} or prismatic {1120}; often rude barrel-shaped crystals. Usually massive; coarse or fine granular.
Physical Properties: Cle...
Graphite
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Graphite C Crystallography:
Hexagonal; 6/m2/m2/m. Usually in foliated or scaly masses, but may be radiated or granular. Crystals tabular, of hexagonal outline with prominent basal plane.
Physical Properties: C...
Sphalerite
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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...
Anothoclase
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Anorthoclase (Na, K) AlSi3 O8 (Feldspar Group) Crystallography:
Triclinic; 1. Twinning common. Physical Properties:
Cleavage: Principle cleavage at right angles or very close to 90°. Fracture uneven; brittle. ...
Beryl
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Beryl Be3 Al2 Si6 O18 Crystallography:
Hexagonal; 6/m2/m2/m. Strong prismatic habit; frequently vertically striated and grooved. Forms usually present consist only of {1010} and {0001}.
Physical Properties: Cl...
Biotite
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Biotite K (Mg, Fe+2)3 (Al, Fe+3) Si3 O10 (OH,F)2 (Mica Group) Crystallography: Monoclinic; 2/m. Usually in irregular foliated masses, and rarely in tabular or short prismatic crystals. Physical Properties:
Cle...
Diabase
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Diabase Type:
Igneous; intrusive. Texture/Appearance:
Often porphyritic; characterized by an ophitic groundmass where intersecting plagioclase laths are partially or completely enclosed by pyroxene. Massive wi...
Ilmenite
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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...
Quartz(Chalcedony)
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Quartz (variety Chalcedony) Si O2 Crystallography:
Hexagonal -R; 32 (low-quartz). Hexagonal; 622 (high quartz). Cryptocrystalline; massive. Often, mammillary, botryoidal, or stalactitic.
Physical Properties: C...
Siltstone
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Siltstone Type:
Sedimentary; clastic. Texture/Appearance:
Silt-sized (<1/16 mm) to very fine sand-sized particles; massive, not laminated (no bedding planes) may exhibit significant clay or sand.
Color: Tan, g...
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