Glassy volcanic rock
Crossword Clue

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AnswerCrossword Clue
OBSIDIANGlassy volcanic rock.
PITCHSTONEGlassy volcanic rock
limburgitea volcanic rock composed of olivine and augite in a fine-grained or glassy groundmass
limburgitesLIMBURGITE, a volcanic rock composed of olivine and augite in a fine-grained or glassy groundmass
apophylliteA mineral occurring typically as white glassy prisms, usually as a secondary mineral in volcanic rocks. It is a hydrated silicate and fluoride of calcium and potassium
PERLITEGlassy rock
LAVAGlassy rock
impactitea rock, typically glassy, produced where a meteor has collided with the earth
impactitesIMPACTITE, a rock, typically glassy, produced where a meteor has collided with the earth