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Minerals

QuestionAnswer
Kaolinite White, grey, brown; Hardness 2; Cleavage present but almost impossible to detect because of tiny crystal size.
Magnetite Black; Dull metallic luster; magnetic; hardness of 5.5-6.5; fracture
Sphalerite root beer brown, yellow, reddish brown; cleavage in 6 directions; hardness pf 3.5-4
Quartz (3 types) colorless, white, pink, purple, brown, red, black; hardness pf 7; fracture; no cleavage; vitreous luster
Biotite Mica black; soft; can scratch easily; one-dimensional cleavage; flat; gold lines; comes apart in sheets
Muskovite Mica blackish; dark; soft; one-dimensional cleavage; flat; transparent
Graphite iron-black to dark-steel grey; metallic, earthy luster; feels greasy, hardness of 1 or 2; cleavage
Plagioclase Feldspar grayish-white; tan; a little shiny; non-metallic; hard; cleavage
Talc pale green, white, pink; pearly luster; hardness of 1; one direction cleavage
Pyroxene black; soft; cleavage; crystals
Olivine Olive green, white, brown, black; vitreous luster; hardness of 6.5; one direction cleavage
Amphibole black; non-metallic; shiny; soft; two-direction cleavage
Orthoclase Feldspar shiny, glassy; orange; hard; cleavage
Hematite red or reddish brown; metallic luster; hardness of 5 to 6; no cleavage; very brittle fracture
Fluorite colorless, green, yellow, purple, pink; vitreous luster; hardness of 4; 4 directional cleavage
Gypsum colorless, white, gray, pink; hardness of 2; one direction cleavage
Pyrite brassy yellow; metallic luster; hardness of 6; fracture
Halite colorless, white, gray; vitreous luster; hardness of 2.5; cubic/ three directional cleavage
Galena lead-gray; metallic luster; hardness of 2.5; three directional cleavage
Calcite colorless, white, gray, red, brown, black; vitreous luster; hardness of 3; reacts strongly to HCl
Created by: ksiegel
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