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MINERAL NAME, FORMULA | ||||
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Dark SILVERY-GRAY, black, or red brown; RED STREAK; H=highly variable and otherwise difficult to determine; heavy; some varieties show 1-way cleavage. Note: Some varieties lack metallic luster and are softer than H=6. | HEMATITE,
Fe2O3 |
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| Black color; black streak; H=6; heavy; MAGNETIC; equant grains. | MAGNETITE,
Fe3O4 |
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| BRASS-YELLOW color; BLACK STREAK; H=6-6.5; often striated cubic crystals. | PYRITE,
FeS2 |
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