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GEOL 212
Mineral Geology
44
Geology
Undergraduate 2
02/29/2012

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Cards

Term
Chromite (FeCr2O4)
Definition
granular crystals, etallic luster, dark-brown streak, H: 5.5
Term
Pyrolusite (MnO2)
Definition
dark black streak, shiny, H: 1-2
Term
Cuprite (Cu2O)
Definition
octahedron, dodecahedron crystals, red clor, brownish-red streak H: 3.5-4
Term
Hematite (Fe2O3)
Definition
tabular crystals, red to reddish-brown color, brownish-red streak, H: 3.5-4
Term
Corundum (Al2O3)
Definition
coarse and fine granular crystals, horizontal striations, colorless streak, brown/pink/blue color, H: 9
Term
Bauxite (mixture of aluminum hydroxides)
Definition
round, concretionary crystals, dull luster, white/grey/yellow/or red color, H: 1-3
Term
Cassiterite (SnO2)
Definition
light-brown streak, prism shaped crystals, white streak, brown or blck color H: 6-7
Term
Rutile (TiO2)
Definition
pale-brown streak, brow-black color, vertically striated, also reddich color H: 6-6.5
Term
ilmenite (FeTiO3)
Definition
grain-like crystals like sand, slightly magnetic, metallic luster, iron0black color, black to brownish red streak
Term
Goethite [FeO(OH)]
Definition
yellow-brown to yellow streak, dark red to vermillion color and dark brown, silky, H: 5-5.5
Term
Halite (NaCl)
Definition
tastes salty, translucent to transparent, greasy luster, colorless or white color, H: 2.5
Term
Magnetite (Fe3O4)
Definition
very magnetic, octahedral crystals, black streak and color, granular or fine-grained crystals, H: 6
Term
Flourite (CaF2)
Definition
purple coloring, very flourescent, cubic or twin crystals, color varies widely, H:4
Term
Columbite-tentalite (Fe, Mn)(Nb, Ta)2O6
Definition
Luster is black and shiny on fresh surface, slightly blueish tarnish, granular crystals, dark brown-> black streak, black color, iridescent
Term
Calcite (CaCO3)
Definition
white or colorless streak, long striated crystals, reacts with acid, granular crystals, H:3
Term
Siderite (FeCO3)
Definition
curved rhombohedral crystals, brown streak, light to dark brown color H: 3.5-4
Term
Rhodochrosite (MnCo3)
Definition
usually some shade of rose-red color, white streak, pink color, rhombohedral cleavage, H:3.5-4
Term
Dolomite [CaMg(CO3)2]
Definition
some shade of pink, flesh color, may be colorless/white/gray, transparent translucent, optics H:3.5-4
Term
Aragonite (CaCO3)
Definition
colorless, white, pale-yellow color, higher specific gravity than calcite, rhombohedral cleavage, H: 3.5-4
Term
Malachite [Cu2(CO3)2(OH)2]
Definition
green color b/c oxidized copper, translucent, pale green streak, H:3.5-4
Term
Azurite [Cu3(CO3)2(OH)2]
Definition
light blue streak, intense azure blue color, transparent to translucent, H: 3.5-4
Term
Gypsum (CaSO4 - 2H2O)
Definition
very soft, easily scratched by fingernail, white or colorless color, tabular crystals, transparent, H:2
Term
Anhydrite (CaSO4)
Definition
sugar-like grain, colorless to gray color, white streak, H: 3-3.5
Term
Barite (BaSO4)
Definition
high specific gravity, white streak, transparent or translucent
Term
Apatite [Ca5(PO4)3(F,Cl,OH)]
Definition
can be scratched by a knife, can be some shade of green, brown or blue, or violet colot, H:5
Term
Scheelite (CaWO4)
Definition
vitreous to adamantine luster, white/yellow/green/brown/blueish-white color, H: 4.5-5
Term
Wolframite (Fe, Mn)WO4
Definition
submetallic luster, black to brown streak, black to brown color, tabular crystals, H: 4-4.5
Term
Sphalerite (ZnS)
Definition
6 perfect cleavage points, streak is light brown to dark brown which is lighter than the specimen, did not scratch the graph H: 3.5-4
Term
Galena (PbS)
Definition
grey-black streak, marked the paper, common form is cubic, bright metallic lusterm soft, H: 2.5
Term
Pyrrhotite Fe(1-x)S
Definition
magnetic, small fragements, black streak, H:4 metallic luster
Term
Chalcopyrite (CuFeS2)
Definition
granular, black streak, usually striated, globular, brittle, metallic luster, crystals resembling tetrahedrons, H: 3.5-4
Term
Cinnabar (HgS)
Definition
low temperature polymorph, scarlet streak, red color, crystals usually rhombohedral, penetrations twins, H:2.5
Term
Pyrite (FeS2)
Definition
striated, granular, black streak, paramagnetic, brittle, H: 6-6.5
Term
Marcasite (FeS2)
Definition
black streak, cockcomb and spear shaped groups, metallic luster, pale bronze-yellow color, H: 6-6.5
Term
Molybdenite (MOS2)
Definition
crystals in hexagonal plates or tapering prisms, flexible but not elastic, grayish-black streak, greasy, metallic luster, H: 1-1.5
Term
Bornite (Cu5FeS4)
Definition
rough, pseudocubic, metallic luster, grayish-black streak, variegated purple and blues for the color, H:3
Term
Chalcocite (Cu2S)
Definition
oxidized copper makes the color black and green, greyish-black streak, pseudo orthorhombic, fine grained, H: 2.5-3
Term
Orpiment (As2S3)
Definition
lemon-yellow streak, brittle, fusible in candle flame, tabular crystals, does not smell like sulfer, H: 1.5-2
Term
Realgar (AsS)
Definition
orang-red streak, brittle, associated with orpiment, H: 1.5-2
Term
Stibnite (Sb2S3)
Definition
long tabular crystals, parallel striations, metallic luster, color and streak led gray to black, H: 2
Term
Arsenopyrite (FeAsS)
Definition
black streak, poor cleavage, metallic luster, silver-white color, H: 5.5-6
Term
Sulfer (S)
Definition
smell, yellow granular pale yellow streak, burs with blue flame H: 1.5-2.5
Term
Graphite (C)
Definition
greasy feeling, black streak, very soft, perfect cleavage, tabular crystals, marks paper and fingers, H:1-1.5
Term
Copper (Cu)
Definition
malleable, cube, dodecahedron, and octahedron faces, branching crystals, fractures, metallic luster, green where oxidized original color red, H: 2.5-3
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