Term
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Definition
| granular crystals, etallic luster, dark-brown streak, H: 5.5 |
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Term
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Definition
| dark black streak, shiny, H: 1-2 |
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Term
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Definition
| octahedron, dodecahedron crystals, red clor, brownish-red streak H: 3.5-4 |
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Term
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Definition
| tabular crystals, red to reddish-brown color, brownish-red streak, H: 3.5-4 |
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Term
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Definition
| coarse and fine granular crystals, horizontal striations, colorless streak, brown/pink/blue color, H: 9 |
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Term
| Bauxite (mixture of aluminum hydroxides) |
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Definition
| round, concretionary crystals, dull luster, white/grey/yellow/or red color, H: 1-3 |
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Term
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Definition
| light-brown streak, prism shaped crystals, white streak, brown or blck color H: 6-7 |
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Term
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Definition
| pale-brown streak, brow-black color, vertically striated, also reddich color H: 6-6.5 |
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Term
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Definition
| grain-like crystals like sand, slightly magnetic, metallic luster, iron0black color, black to brownish red streak |
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Term
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Definition
| yellow-brown to yellow streak, dark red to vermillion color and dark brown, silky, H: 5-5.5 |
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Term
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Definition
| tastes salty, translucent to transparent, greasy luster, colorless or white color, H: 2.5 |
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Term
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Definition
| very magnetic, octahedral crystals, black streak and color, granular or fine-grained crystals, H: 6 |
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Term
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Definition
| purple coloring, very flourescent, cubic or twin crystals, color varies widely, H:4 |
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Term
| Columbite-tentalite (Fe, Mn)(Nb, Ta)2O6 |
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Definition
| Luster is black and shiny on fresh surface, slightly blueish tarnish, granular crystals, dark brown-> black streak, black color, iridescent |
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Term
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Definition
| white or colorless streak, long striated crystals, reacts with acid, granular crystals, H:3 |
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Term
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Definition
| curved rhombohedral crystals, brown streak, light to dark brown color H: 3.5-4 |
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Term
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Definition
| usually some shade of rose-red color, white streak, pink color, rhombohedral cleavage, H:3.5-4 |
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Term
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Definition
| some shade of pink, flesh color, may be colorless/white/gray, transparent translucent, optics H:3.5-4 |
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Term
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Definition
| colorless, white, pale-yellow color, higher specific gravity than calcite, rhombohedral cleavage, H: 3.5-4 |
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Term
| Malachite [Cu2(CO3)2(OH)2] |
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Definition
| green color b/c oxidized copper, translucent, pale green streak, H:3.5-4 |
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Term
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Definition
| light blue streak, intense azure blue color, transparent to translucent, H: 3.5-4 |
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Term
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Definition
| very soft, easily scratched by fingernail, white or colorless color, tabular crystals, transparent, H:2 |
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Term
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Definition
| sugar-like grain, colorless to gray color, white streak, H: 3-3.5 |
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Term
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Definition
| high specific gravity, white streak, transparent or translucent |
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Term
| Apatite [Ca5(PO4)3(F,Cl,OH)] |
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Definition
| can be scratched by a knife, can be some shade of green, brown or blue, or violet colot, H:5 |
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Term
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Definition
| vitreous to adamantine luster, white/yellow/green/brown/blueish-white color, H: 4.5-5 |
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Term
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Definition
| submetallic luster, black to brown streak, black to brown color, tabular crystals, H: 4-4.5 |
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Term
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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 |
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Term
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Definition
| grey-black streak, marked the paper, common form is cubic, bright metallic lusterm soft, H: 2.5 |
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Term
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Definition
| magnetic, small fragements, black streak, H:4 metallic luster |
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Term
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Definition
| granular, black streak, usually striated, globular, brittle, metallic luster, crystals resembling tetrahedrons, H: 3.5-4 |
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Term
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Definition
| low temperature polymorph, scarlet streak, red color, crystals usually rhombohedral, penetrations twins, H:2.5 |
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Term
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Definition
| striated, granular, black streak, paramagnetic, brittle, H: 6-6.5 |
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Term
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Definition
| black streak, cockcomb and spear shaped groups, metallic luster, pale bronze-yellow color, H: 6-6.5 |
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Term
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Definition
| crystals in hexagonal plates or tapering prisms, flexible but not elastic, grayish-black streak, greasy, metallic luster, H: 1-1.5 |
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Term
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Definition
| rough, pseudocubic, metallic luster, grayish-black streak, variegated purple and blues for the color, H:3 |
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Term
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Definition
| oxidized copper makes the color black and green, greyish-black streak, pseudo orthorhombic, fine grained, H: 2.5-3 |
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Term
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Definition
| lemon-yellow streak, brittle, fusible in candle flame, tabular crystals, does not smell like sulfer, H: 1.5-2 |
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Term
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Definition
| orang-red streak, brittle, associated with orpiment, H: 1.5-2 |
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Term
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Definition
| long tabular crystals, parallel striations, metallic luster, color and streak led gray to black, H: 2 |
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Term
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Definition
| black streak, poor cleavage, metallic luster, silver-white color, H: 5.5-6 |
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Term
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Definition
| smell, yellow granular pale yellow streak, burs with blue flame H: 1.5-2.5 |
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Term
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Definition
| greasy feeling, black streak, very soft, perfect cleavage, tabular crystals, marks paper and fingers, H:1-1.5 |
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Term
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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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