• Scoria - Wikipedia

    Scoria is a highly vesicular, dark colored volcanic rock that may or may not contain crystals (phenocrysts).It is typically dark in color (g

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  • Scoria | rock | Britannica

    Scoria, heavy, dark-coloured, glassy, pyroclastic igneous rock that contains many vesicles (bubblelike cavities). Foamlike scoria, in which the bubbles are ver

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