porous grey volcanic rock lava stone pumice with distinctive pores |
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| navigate by keyword : geological minerals gemological gemmology volcanic material stone porous nature macro geology closeup black texture volcano rock isolated rough background brown natural wall gray lava object igneous mineral white magma sample basaltic basalt pattern surface grey |
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| Porous grey volcanic rock isolated on white background. Lava stone, pumice stone, or volcanic pumice with distinctive pores. |
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