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| navigate by keyword : analysis anthracite black broken carbon clamp clamped closeup coal environment equipment experiment field formation fossil fragment geology geologywork hard hardness industrial investigation lab laboratory laboratorywork material materialscience metal mineral mineralogy mining natural preparation quality research rock rough sample science sciencework site specimen steel stone study surface testing testingequipment texture tool |
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| Anthracite coal, a sample of stone for laboratory research |
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Stockphotos.ro (c) 2026. All stock photos are provided by Dreamstime and are copyrighted by their respective owners. |
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