Planet Earth Minerals Part II

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Last updated 11:47 PM on 10/1/26
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7 Terms

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Mineral formation and precipitation

Minerals form from cooling, precipitation, or metamorphism; precipitation = dissolved ions form minerals when water evaporates/mixes

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Color, streak, and luster

Color can vary; streak = powder color and is more reliable; luster = how light reflects

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Mohs hardness and scratch tests

Hardness = resistance to scratching; Mohs scale 1–10

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Crystal habit, and cleavage, and fracture

Cleavage = breaks along flat planes; Fracture = irregular/no planes

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Acid and magnet tests

Acid fizz = calcite; Magnetic = magnetite

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Silicates in Earth’s crust and mantle

 Silicates are the most abundant mineral group in the earth's crust

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Silicate tetrahedra

Molecule of silica, 1 silica 4 oxygen