Radience

Rocks and Minerals

Science

cleavage

the tendency of a mineral to break along flat surfaces
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crystal

a solid of ions or atoms arranged in an orderly three-dimensional pattern
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density

an object’s mass per unit volume
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fracture

an irregular break in a mineral
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gem

a rare, valuable mineral
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hardness

a mineral’s resistance to scratching
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lava

molten rock that reaches the Earth's surface
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luster

the way a mineral's surface reflects light
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magma

molten rock beneath the Earth's surface
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mineral

a natural inorganic solid with definite chemical composition and structure
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ore

a rock that contains enough mineral to be mined for profit
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silicate

a mineral with silicon, oxygen, and other elements
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streak

a color of a mineral in its powdered form
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