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Anthracite coal is so hard and pure it is also referred to as a _____.

Anthracite coal is so hard and pure it is also referred to as a _____.
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Anthracite coal is so hard and pure it is also referred to as a _____.

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User Tacaswell
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Anthracite coal is considered a metamorphic rock because the original rock was subject to high heat and pressure which causes the rock to change
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User Marknadal
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