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Mineral and Rock Guide booked - CCSF
Layers of crystals – formed from evaporation of water. Evaporitic or crystalline limestone Precipitation in salt lakes and inland seas. Quartz SiO 2 Interlocking texture, crystals too fine to see. White, red, brown, black, or green. Chert
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Mineral Identification Chart – LECTURE - CCSF
fog.ccsf.eduright angles. Twinning. 2 cleavages at 90°. Potassium Feldspar family: Orthoclase and Microcline KAlSi3O8 6 2.5-2.6 White Pink. Or white, orange, brown, gray, green. Translucent to opaque. Tabular crystals 2 good cleavage planes at nearly right angles. Subparallel exsolution lamellae. 2 cleavages at 90°. Pink color. Pyroxene family: Augite
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