GEO 101 Lab quiz Minerals

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Last updated 4:42 AM on 9/22/26
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16 Terms

1
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Muscovite

• Non-metallic luster

• Light color

• Hardness: 2.5-3.0

• 1 perfect plane of cleavage

• White streak

• Appears to be sheets or plates

<p>• Non-metallic luster </p><p>• Light color </p><p>• Hardness: 2.5-3.0 </p><p>• 1 perfect plane of cleavage </p><p>• White streak </p><p>• Appears to be sheets or plates</p>
2
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Biotite

• Non-metallic luster

• Dark color

• Hardness: 2.5-3.0

• 1 perfect plane of cleavage

• Gray steak

• Appears to be sheets or plates

<p>• Non-metallic luster </p><p>• Dark color </p><p>• Hardness: 2.5-3.0 </p><p>• 1 perfect plane of cleavage </p><p>• Gray steak </p><p>• Appears to be sheets or plates</p>
3
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Gypsum

• Non-metallic luster

• Hardness: 2.0 (fingernail)

• 1 perfect plane of cleavage

• White streak

• Translucent appearance

<p>• Non-metallic luster </p><p>• Hardness: 2.0 (fingernail) </p><p>• 1 perfect plane of cleavage </p><p>• White streak </p><p>• Translucent appearance</p>
4
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Calcite

• Non-metallic luster

• Hardness: 3.0 (copper/penny)

• 3 perfect, parallel cleavage plans; rhombic or parallelogram

• White streak

• Reacts with acid (HCl)

<p>• Non-metallic luster </p><p>• Hardness: 3.0 (copper/penny) </p><p>• 3 perfect, parallel cleavage plans; rhombic or parallelogram </p><p>• White streak </p><p>• Reacts with acid (HCl)</p>
5
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Quartz

• Non-metallic luster

• Hardness: 7.0 (scratches glass)

• No cleavage; fracture

• White streak

• Glassy texture/appearance

• Various colors

<p>• Non-metallic luster </p><p>• Hardness: 7.0 (scratches glass) </p><p>• No cleavage; fracture </p><p>• White streak </p><p>• Glassy texture/appearance</p><p>• Various colors</p>
6
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Halite

• Non-metallic luster

• Hardness: 2.5

• 3 perfect planes (cube)

• White streak

• Tastes salty

<p>• Non-metallic luster </p><p>• Hardness: 2.5 </p><p>• 3 perfect planes (cube) </p><p>• White streak </p><p>• Tastes salty</p>
7
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Magnetite

• Metallic luster

• Strongly magnetic

• Hardness: 5.5-6.0

• Black streak

<p>• Metallic luster </p><p>• Strongly magnetic </p><p>• Hardness: 5.5-6.0 </p><p>• Black streak</p>
8
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Hematite

• Metallic/earthy luster

• Weakly magnetic

• Hardness: 6.5

• Reddish/brown streak

• Can appear as an earthy, red form and a shiny metallic luster

<p>• Metallic/earthy luster </p><p>• Weakly magnetic </p><p>• Hardness: 6.5 </p><p>• Reddish/brown streak </p><p>• Can appear as an earthy, red form and a shiny metallic luster</p>
9
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Pyrite

• Metallic luster

• None magnetic

• Hardness: 6.5

• Gray/green/black streak

• Can form small cubes

• "Fool's gold"

<p>• Metallic luster </p><p>• None magnetic </p><p>• Hardness: 6.5 </p><p>• Gray/green/black streak </p><p>• Can form small cubes </p><p>• "Fool's gold"</p>
10
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Graphite

• Metallic luster

• None magnetic

• Hardness: 1.5-2.0

• Gray streak

• Writes like a pencil

<p>• Metallic luster </p><p>• None magnetic </p><p>• Hardness: 1.5-2.0 </p><p>• Gray streak </p><p>• Writes like a pencil</p>
11
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Amphibole

• Non-metallic luster

• Dark color

• Hardness:5.0-6.0

• 2 perfect planes of cleavage at 60° and 120°

• Gray/white/colorless streak

• Can have a needle-like fibrous appearance

<p>• Non-metallic luster </p><p>• Dark color </p><p>• Hardness:5.0-6.0 </p><p>• 2 perfect planes of cleavage at 60° and 120° </p><p>• Gray/white/colorless streak </p><p>• Can have a needle-like fibrous appearance</p>
12
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Pyroxene

• Non-metallic luster

• Dark color

• Hardness: 5.0-6.0

• 2 perfect planes of cleave at 90°

• Greenish/gray streak

• Blocky appearance

<p>• Non-metallic luster </p><p>• Dark color </p><p>• Hardness: 5.0-6.0 </p><p>• 2 perfect planes of cleave at 90° </p><p>• Greenish/gray streak </p><p>• Blocky appearance</p>
13
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Fluorite

• Non-metallic; translucent

• Dark(ish) color

• Hardness: 4.0

• Cube or diamond shape

• White streak

• Often purple/blue/green

<p>• Non-metallic; translucent </p><p>• Dark(ish) color </p><p>• Hardness: 4.0 </p><p>• Cube or diamond shape </p><p>• White streak </p><p>• Often purple/blue/green</p>
14
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Olivine

• Non-metallic

• Dark(ish) color

• Hardness: 6.5-7.0

• No cleavage

• White streak

• Sugar-like texture

<p>• Non-metallic </p><p>• Dark(ish) color </p><p>• Hardness: 6.5-7.0 </p><p>• No cleavage </p><p>• White streak </p><p>• Sugar-like texture</p>
15
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Talc

• Non-metallic

• Light colored

• Hardness: 1.0 (very soft)

• White streak

• Soapy or greasy look/feel

<p>• Non-metallic </p><p>• Light colored </p><p>• Hardness: 1.0 (very soft) </p><p>• White streak </p><p>• Soapy or greasy look/feel</p>
16
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Feldspar

• Non-metallic • Light colored • Hardness:6.0-6.5 • 2 planes of cleavage at 90° • White streak

<p>• Non-metallic • Light colored • Hardness:6.0-6.5 • 2 planes of cleavage at 90° • White streak</p>