Geology rocks and minerals

Biotite

Thin, black, flakey, translucent, appears almost amber in light

Chalocopyrite

Goldish/green/black/grey and metallic

Diamond

Derived from Kimberlite, strongest mineral

Chrysotile

95% of the asbestos in the US, very toxic, its almost stringy

Yooperlite- sodalite

Mineral is sodalite, shines under UV light

Sphalerite

ZnS, a mixture of brown/black, yellow streak is produced, greasy, resinous (amber), cleavage, hardness=4, smells like rotten egg when scratched, there is 6 planes, group sulphide, economic use: ore of zinc

Fluorite

CaF2, yellow/brown/grey color, streak is white, luster is glassy, cleavage, hardness=4, flouresent, group=Halides, economic use: source of fluorine

Gypsum

CaSO4 × 2H2O, White/cream/translucent, streak is white, pearly to vitreous, perfect and imperfect cleavage, hardness=2, very soft, group=solfates, economic use: dry wall, ag, fire resistance

Galena

PbS, grey earthy yellow colors, black streak, luster= metallic, cubic cleavage, hardness=3, very heavy (specific gravity= 3.5), group=Sulphides, economic use: lead production/silver extraction

Hematite

Fe2O3, steel blue/dark grey, red brown streak, luster=metallic, fracture, hardness scale 2-6, Steely, Flake, group=oxides, economic use: compound of limestone/marble filler in paints/pigments

Graphite

Dark grey, shiny and metallic, fracture, hardness=1, fractures with contact of an object, group= native, economic use: writing utensils, lithium ion batteries

Kailinite

Hydrous Al silicate, color and streak is white, luster is very greasy, cleavage, hardness=1-2, very chalk like, group=clay, economic use: paper production, ceramics

Halite

NaCl, Translucent color, white streak, luster is vitreous(glassy), cleavage, hardness=2.5, very salty, group= halides, economic use: food processing, road salt, water softening

Talc

Hydrous Mg silicate, whitish/grey, white streak, shiny and greasy, fracture, hardness=1, flakes, group=silicates, economic use: cosmetics, paper production, personal care

Magnetite

Fe2O4, dark black/grey streak is grey, luster=shiny, metallic (kinda dull), cleavage, hardness=6, magnetic, group= oxides, economic use: manufacturing of steel for bridges, buildings, etc

Malachite

CuCO3Cu(OH)2, color green, dull, no cleavage/fracture, hardness=3.5-4, green is due to oxidation, group=carbonate, economic use: copper ore

Pyrite (fools gold)

FeS2 Pale brass/yellow colors, very shiny+metallic, cleavage, hardness=6, group= sulphides, economic use: modern batteries

Quartz

SiO2, color varies from browns-purples-translucent, streak is brown?, vitreous (glassy), conchoidal fractures, hardness= 7, group=feldspar, concrete and jewelry

muscovite

Corundum

Calcite

Beryl

Sulfur

Flint

Bauxite

Chalocopyrite

Biotite