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10 Cards in this Set
- Front
- Back
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Biotite
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NM <2½1 (2½-3) 1dir perfect Cleavage Brownish black Cleavage, color, luster
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Muscovite
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NM <2½ (2-2½) 1 dir perfect Cleavage Pale tan to colorless Cleavage, color, luster
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Galena
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Metallic 2½-3 (2½) 3 Cleavages = 90° Gray (silver)/ Lead gray Very high density
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Pyrite (fool's gold)
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Metallic > 5½ (6) Irregular fracture Dark gray to green-black Color and luster
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Calcite
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NM 3 3 Cleavages ≠ 90° Colorless, white, gray, pink Effervesces with dilute HCl, double refraction
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Halite
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NM 2½-3 3 Cleavages = 90° Colorless Salty taste, dissolves in water or on moist fingers
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Hornblende
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NM > 5½ (5½) 2 Cleavages ≠ 90° Black Color, luster, cleavage
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K- Feldspar orthoclase
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NM > 5½ (6) 2 Cleavages ≈ 90° Pinkish or salmon Hardness, cleavage
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Plagioclase Feldspar
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NM > 5½ (6) 2 Cleavages ≈ 90° Pale greenish gray Hardness, cleavage, twinning
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Quartz
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NM > 5½ (7) Conchoidal fracture Gray Fracture, hardness
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