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5 Cards in this Set
- Front
- Back
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C
Hexagonal Crystals are uncommon and usually small. Diag: Softness & luster H:1-2 S:Black SG:1.9-2.3 L:Metallic, Dull, Earthy Occurs in regional/contact metamorphism. Assoc: Calcite, Quartz, Muscovite, Biotite in Marble. |
Graphite
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C
Isometric Usually octahedral, with many crystal faces. Diag: Hardness & luster H = 10. S:none SG:3.1-3.53 L:Clean=Adamantine/Dirty=Greasy Occurs chiefly in Kimberlite pipes and volcanic necks. Placer deposits with gravels. Assoc:Olivine, Magnetite, Pyrope, Phologopite in Kimberlite |
Diamond
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S
Orthorhombic Massive, earthy specimens are prevalent Diag: rotten-egg like odor. H:1.5-2.5 S: White SG:2.0-2.1 L: Clean=Adamantine else resinous or dull |
Sulfur
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Cu
Isometric Usually distorted masses or crystals. Crystals cubic or dodecahedral, flattened crystals, scales, dendrites, and wires. Diag: Red color and metal H: 2.5-3 S: copper SG:8.93. L: Metallic Occurs in oxi-zone of copper-bearing sulfide ore deposits. Assoc: Calcite, Cuprite, Malachite, Azurite, and Silver. |
Copper
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Au
Isometric Octahedral, dodecahedral, and cubic crystals (uncommon & distorted) Dendrites, wires, nuggets, and small flakes are more common. Diag: Golden-yellow color, extreme heaviness, lack of tarnish, and extreme malleability and ductility. H: 2.5 - 3 S: gold SG: 15.5-19.3 L: Metallic Occurs chiefly in hydrothermal veins. In auriferous conglomerates. Assoc: Quartz, Pyrite, Arsenopyrite, Silver. |
Gold
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