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5 criteria
1) Naturally occurring
2) Solid
3) Inorganic
4) Definite Chemical Composition
5) Crystalline Structure

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A minerals resistance to being scratched. Higher #'s mean more resistant, or harder to scratch.

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Chemical property of Calcite

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The Powdered form of a Mineral

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The way a mineral reflects light. Metallic vs Non-metallic

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Breaks along straight, smooth lines

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Uneven breakage