Mineral Identification Quiz: Oxides & Halides

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14 Terms

Bauxite

Chemical formula: Al(OH)₃
Color:
Streak:
Hardness:
Luster:
Cleavage/Fracture:

<ul><li><p>Chemical formula: Al(OH)<sub>3</sub></p></li><li><p>Color:</p></li><li><p>Streak:</p></li><li><p>Hardness:</p></li><li><p>Luster:</p></li><li><p>Cleavage/Fracture:</p><p></p></li></ul><p></p>

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Corundum

Chemical formula: Al₂O₃
Color:
Streak:
Hardness:
Luster:
Cleavage/Fracture:

<ul><li><p>Chemical formula: Al<sub>2</sub>O<sub>3</sub></p></li><li><p>Color:</p></li><li><p>Streak:</p></li><li><p>Hardness:</p></li><li><p>Luster:</p></li><li><p>Cleavage/Fracture:</p></li></ul><p></p>

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Geothite

Chemical formula: FeO(OH)
Color:
Streak:
Hardness:
Luster:
Cleavage/Fracture:

<ul><li><p>Chemical formula: FeO(OH)</p></li><li><p>Color:</p></li><li><p>Streak:</p></li><li><p>Hardness:</p></li><li><p>Luster:</p></li><li><p>Cleavage/Fracture:</p></li></ul><p></p>

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Hematite

Chemical formula: Fe₂O₃
Color:
Streak:
Hardness:
Luster:
Cleavage/Fracture:

<ul><li><p>Chemical formula: Fe<sub>2</sub>O<sub>3</sub></p></li><li><p>Color:</p></li><li><p>Streak:</p></li><li><p>Hardness:</p></li><li><p>Luster:</p></li><li><p>Cleavage/Fracture:</p></li></ul><p></p>

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Ilmenite

Chemical formula: FeTiO₃
Color: blackish-silver
Streak: grey
Hardness: 5-6
Luster: metallic
Cleavage/Fracture: uneven fracture
Other: slightly magnetic

$<ul><li>Chemical formula: FeTiO3</li><li>Color: blackish-silver</li><li>Streak: grey</li><li>Hardness: 5-6</li><li>Luster: metallic</li><li>Cleavage/Fracture: uneven fracture</li><li>Other: slightly magnetic</li></ul>$

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Pyrolusite

Chemical formula: MnO₂
Color:
Streak:
Hardness:
Luster:
Cleavage/Fracture:

<ul><li><p>Chemical formula: MnO<sub>2</sub></p></li><li><p>Color:</p></li><li><p>Streak:</p></li><li><p>Hardness:</p></li><li><p>Luster:</p></li><li><p>Cleavage/Fracture:</p></li></ul><p></p>

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Limonite

Chemical formula: FeO(OH)nH2O
Color:
Streak:
Hardness:
Luster:
Cleavage/Fracture:

<ul><li><p>Chemical formula: FeO(OH)nH2O</p></li><li><p>Color:</p></li><li><p>Streak:</p></li><li><p>Hardness:</p></li><li><p>Luster:</p></li><li><p>Cleavage/Fracture:</p></li></ul><p></p>

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Rutile

Chemical formula: TiO2
Color: black/rusty reddish orange
Streak: rusty red
Hardness: 6-6.5
Luster: metallic
Cleavage/Fracture: 2 cleavage planes, not 90 degrees

<ul><li><p>Chemical formula: TiO2</p></li><li><p>Color: black/rusty reddish orange</p></li><li><p>Streak: rusty red</p></li><li><p>Hardness: 6-6.5</p></li><li><p>Luster: metallic</p></li><li><p>Cleavage/Fracture: 2 cleavage planes, not 90 degrees</p></li></ul><p></p>

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Chromite

Chemical formula: FeCr₂O₄
Color:
Streak:
Hardness:
Luster: sub-metallic
Cleavage/Fracture: uneven fracture

$<ul><li>Chemical formula: FeCr2O4</li><li>Color:</li><li>Streak:</li><li>Hardness:</li><li>Luster: sub-metallic</li><li>Cleavage/Fracture: uneven fracture</li></ul>$

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Magnetite

Chemical formula: Fe₃O₄
Color:
Streak:
Hardness:
Luster: metallic
Cleavage/Fracture: uneven fracture

$<ul><li>Chemical formula: Fe3O4</li><li>Color:</li><li>Streak:</li><li>Hardness:</li><li>Luster: metallic</li><li>Cleavage/Fracture: uneven fracture</li></ul>$

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Gahnite

Chemical formula: ZnAl₂O₄
Color: greenish black
Streak: grey
Hardness: 7.5-8
Luster: vitreous (glassy)
Cleavage/Fracture: uneven fracture

$<ul><li>Chemical formula: ZnAl2O4</li><li>Color: greenish black</li><li>Streak: grey</li><li>Hardness: 7.5-8</li><li>Luster: vitreous (glassy)</li><li>Cleavage/Fracture: uneven fracture</li></ul>$

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Fluorite

Chemical formula: CaF₂
Color: anything
Streak: white
Hardness: 4
Luster: vitreous
Cleavage/Fracture: uneven/sub-conchoidal fracture

$<ul><li>Chemical formula: CaF2</li><li>Color: anything</li><li>Streak: white</li><li>Hardness: 4</li><li>Luster: vitreous</li><li>Cleavage/Fracture: uneven/sub-conchoidal fracture </li></ul>$