Term
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Definition
Mineral 2: Galena
Cubic Cleavage
Metallic Luster
Dark Grey Streak
High Specific Gravity |
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Term
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Definition
Mineral 3: Biotite Mica
Color black, green-black, brown-black
Excellent cleavage in one direction
Splits into thin flexible sheets
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Term
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Definition
Mineral 1: Earthy Hematite
Red-Brown Streak
Soft, comes off on hands.
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Term
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Definition
Mineral 8: Halite
Salty Taste!
Soft - Hardness = 2.5
Forms cubes, and breaks into cubes |
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Term
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Definition
Mineral 6: Muscovite Mica
Perfect, basal cleavage
Splits into thin transparent sheets
Usually colorless to yellow |
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Term
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Definition
Mineral 7: Graphite
Very soft
Dark Grey Cleavage
Metallic Luster |
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Term
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Definition
Mineral 4: Quartz (var. Rose)
Hardness of 7, scratches glass
Transparent to translucent
No cleavage, conchodial fracture
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Term
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Definition
Mineral 10: Calcite
Effervesces with Hydrochloric acid
Usually colorless to white
Breaks into rhombohedrons
Soft - Hardness = 3 |
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Term
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Definition
Mineral 11: Garnet
Scratches glass
Usually a red-black-brown color
Forms dodecahedrons (12 sided shape almost like spheres)
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Term
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Definition
Mineral 9: Potassium Feldspar
2 Excellent cleavages at almost 90 degrees
Color usually orange to pink |
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Term
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Definition
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Term
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Definition
Mineral 15: Fluorite
Will not scratch glass
Excellent cleavage (although not present in most samples)
Usually transparent (for our samples), but sometimes opaque |
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Term
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Definition
Mineral 16: Magnetite
Magnetic
Scratches glass
May have yellow "rust" marks |
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Term
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Definition
Mineral 17: Olivine
Scratches glass - hardness = 7
Color usually pale to olive green
Forms short crystals that may look like sand grains |
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Term
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Definition
Mineral 13: Metallic Hematite
Harder than Earthy variety
Distinct shiny metallic luster |
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Term
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Definition
Mineral 14: Augite
Two good cleavages nearly 90 degrees
Color dark green to gray |
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Term
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Definition
Mineral 20: Pyrite
Scratches glass, H= 6-6.5
Color gold, metallic luster
Poor cleavage
Often cubic crystal form |
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Term
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Definition
Mineral 19: Talc
Very soft, H=1
No cleavage
Has a soapy, greasy feel |
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Term
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Definition
Mineral 18: Plagioclase Feldspar
Our samples typically have a gray color
Two good cleavages nearly 90 degrees
Forms striations in sample, (may look like scratches)
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Term
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Definition
Mineral 22: Apatite
Will not scratch glass
Conchodial fracture (no cleavage)
Often forms hexagonal prisms
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Term
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Definition
Mineral 21: Corundum
Very Hard, H=9
No cleavage
Forms hexagonal prisms |
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