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12 Pack - Coarse White Marble, Metamorphic Rock Specimens - Approx. 1"

COARSE WHITE MARBLE | Marble is a metamorphic rock formed from limestone. The high-pressure, low-heat alteration leads to a massive crystalline ro...

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ESNG0057PK12

12 Pack - Raw Green Slate, Metamorphic Rock Specimens - Approx. 1"

GREEN SLATE | Slate is very lightly metamorphosed and well-foliated. This appearance often makes it difficult to distinguish from its parent rock,...

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ESNG0086PK12