Term
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Definition
Mineral
Galena
Metallic, Soft, Dark Gray
Cleavage - good to excellent
Crystals - cubes or octahedrons |
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Term
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Definition
Mineral
Magnetite
Hard, Dark Gray, silvery dark gray
Strongly attracted to magnet
No cleavage
Crystals- octahedrons |
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Term
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Definition
Mineral
Muscovite Mica
Non metallic
Soft, colorless, yellow
Short opaque prisms
1 Excellent cleavage into think flexible sheets |
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Term
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Definition
Mineral
Biotite mica
non metallic
Soft
Excellent cleavage, short opaque prisms |
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Term
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Definition
Mineral
Potassium Feldspar
Non metallic - hard
Translucent brown, gray, green
2 cleavages at nearly right angles
exsolution lamellae |
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Term
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Definition
Mineral
Plagioclase Feldspar
Nonmetallic-dark
Translucent dark gray, blue gray, black
may have silvery iridenscence
2 cleavages at nearly 90 degrees and with striations |
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Term
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Definition
Mineral
Calcite
Non metallic- light colored
Soft
Cleavage good or excellent, rhombohedrons
Collorless, white, yellow
Effervesces in dilute hcl |
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Term
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Definition
Mineral
Pyrite
Metallic
Hard, Dark gray
Silvery gold, tarnishes brown
Cleavage absent or poor
Brittle crystals, cubes, pyritohedrons |
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Term
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Definition
Mineral
Hornblende
Non metallic- dark
Hard, dark gray to black
2 cleavages at 56 and 124
splintery |
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Term
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Definition
Mineral
Olivine
Nonmetallic - dark
Hard
Cleavage absent- conchoidal fracture
Transparent or translucent olive green |
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Term
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Definition
Mineral
Augite Peroxine
Non metallic- dark
Hard, cleavage good or excellent
2 cleavages 93 and 87
Dark green to black |
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Term
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Definition
Mineral
Quartz
Nonmetallic-light colored
Cleavage poor or absent
Colorless white, gray
Greasy luster, massive hexagonal prisms and pyramids
transparent or translucent |
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