Term
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Definition
Muscovite Mica
Luster: nonmetal
Hardness: soft 2-2.5
Cleavage: excellent, basal
Streak: white
Clarity: opaque
Crystal form: tabular |
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Term
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Definition
Quartz
Luster: nonmetal
Hardness: Hard 7
Cleavage: poor/none
Streak: white
Clarity: translucent
Crystal Form:dipyramid prismatic |
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Term
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Definition
Olivine
Luster: nonmetal
Hardness: Hard 7
Cleavage: poor
Streak: white
Clarity: opaque
Crystal Form: botryoidal
**Feels like sand, ball shape
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Term
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Definition
Milky Quartz
Luster: nonmetal
Cleavage: poor/none
Streak: white
Clarity: opaque
Crystal form: isometric |
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Term
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Definition
Potassium Feldspar
Luster: nonmetal
Hardness: Hard 6
Cleavage: good, 2 at 90 degrees
Streak: white
Clarity: opauqe
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Term
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Definition
Rose Quartz
Luster: nonmetal
Hardness: Hard 7
Cleavage: none
Streak: white
Clarity: opaque
Crystal Form: tetragonal |
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Term
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Definition
Biotite Mica
Luster: nonmetal
Hardness: soft 2.5-3
Cleavage: excellent, Basal
Streak: light gray/brown
Clarity: opaque
Crystal Form: tabular
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Term
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Definition
Augite
Luster: nonmetal
Hardness: Hard 5.5-6
Cleavage: good, 2 @ 90 degree
Streak: white to pale gray
Clarity: opaque
Crystal Form: cubish
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Term
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Definition
Na Plagioclase Feldspar
Luster: nonmetal
Hardness: Hard 6
Cleavage: good, 2 at 90 degrees
Streak: white
Clarity: opaque
Crystal Form: Triclinic |
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Term
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Definition
Potassium Feldspar
Luster: nonmetal
Hardness: Hard 6
Cleavage: excellent,3 not at 90 degrees
Streak: white
Clarity: opaque
Crystal Form: isotoic |
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Term
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Definition
Hornblende
Luster: nonmetal
Hardness: Hard 5.5
Cleavage: good at 56 and 124 degrees
Streak:white to pale gray
Clarity: opauque
Crystal Form: prismatic |
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Term
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Definition
CA-Plagioclase Feldspar
Luster: nonmetal
Hardness: Hard 6
Cleavage: good, 2 near 90 degrees
Streak: white
Clarity: translucent
Crystal Form: isometric
Color: grayish cream, black-blue |
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Term
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Definition
Gypsum
Luster: nonmetal
Hardness: Soft 2
Cleavage: excellent, basal
Streak: white
Clarity: translucent
Crystal Form: tabular |
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Term
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Definition
Calcite
Luster: nonmetal
Hardness: Soft 3
Cleavage: excellent, 3 directions not 90 degrees
Streak: white
Clarity: translucent
Crystal Form: prisms or rhombohedrons
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Term
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Definition
Pyrite
Luster: metal
Hardness: Hard 6-6.5
Cleavage: poor
Streak: dark gray
Clarity: opaque
Crystal Form: cubic |
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Term
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Definition
Hematite
Luster: metal
Hardness: soft/hard 1-6
Cleavage: none
Streak: pink-purple brown
Clarity: obaque
Crystal Form: cubic
**Can be redish too! |
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Term
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Definition
Magnetitc
Luster: metal
Hardness: Hard 6-6.5
Cleavage: none
Streak: dark grey
Clarity: Opaque
Crystal Form: isotomic
**magnetic |
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Term
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Definition
Limonite
Luster: Metal
Hardness: Hard/Soft 1-5.5
Cleavage: poor/none
Streak: yellow-brown
Clarity: opaque
Crystal Form: prisms |
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Term
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Definition
Sphalerite
Luster: Metal
Hardness: Soft 3.5-4
Cleavage: good, 3 directional
Streak: cream
Clarity: opaque
Crystal Form: Pyritohedron
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Term
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Definition
Kaolinite
Luster: nonmetal
Hardness: Soft 1-2
Cleavage: excellent, but absent in hand samples
Streak: white
Clarity: opaque
Crystal Form: microcrystalline masses |
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Term
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Definition
Graphite
Luster: metal
Hardness: Soft, 1
Cleavage: excellent, basal
Streak: gray
Clarity: opaque
Crystal Form: prims |
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Term
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Definition
Halite
Luster: nonmetal
Hardness: Soft, 2.5
Cleavage: good, 3 directions at 90 degrees
Streak: white
Clarity: translucent
Crystal Form: tubular/prism |
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Term
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Definition
Galena
Luster: metal
Hardness: Soft, 2.5
Cleavage: 3-directional at 90 degrees
Streak: gray
Clarity: opaque
Crystal Form: prism |
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