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| navigate by keyword : analysis anthracite black broken carbon clamp clamped closeup coal deposit environment equipment experiment formation fossil fossilfuel fragment geological geology hard hardness heavy industrial inspection lab laboratory laboratorywork material materialscience metal mineral mining natural particle quality research rock rocksample rugged sample science 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) 2025. All stock photos are provided by Dreamstime and are copyrighted by their respective owners. |
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