Minerals and Their Properties

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What are the characteristics of a mineral?

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a) Naturally occurring b) Solid c) Inorganic d) Crystalline structure e) Definite chemical composition

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What is 'streak' in terms of mineral properties?

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The color of a mineral’s powder as it is rubbed against a 'streak plate'.

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Color

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The color of a mineral is difficult because many have the same color

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What is 'luster' in terms of mineral properties?

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The way a mineral reflects light from its surface; can be metallic or non-metallic.

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What is 'hardness' in terms of mineral properties?

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A measure of a mineral's resistance to scratching, often measured by the Mohs scale.

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Cleavage

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The tendency of a mineral to break along flat surfaces.

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Moh's Scale of Hardness

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Determines the relative hardness of a mineral based on common minerals and objects.

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Rocks are classified by:

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How they form

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Rock Colors are from

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they types and colors of the minerals found in them.

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Igneous Rocks

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form from magma and lava