raw specimen rhyolite extrusive igneous rock stone isolated white background |
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| navigate by keyword : black boulder brown carbon carbonate carving charcoal clay closeup coal divided economic feldspar formation fossil fuel geology granite hand isolated jewellery macro microcline mineral museum natural nature object ore piece raw realgar rock rough sculpture specimen stone sulfate value sample hard oxides white minerals crystal background rhyolite extrusive igneous |
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| To geologists, a rock is a natural substance composed of solid crystals of different minerals that have been fused together into a solid lump. |
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