A type of volcanic rock (porphyry) that contains prominent crystals of albite set in a finer-grained ground mass.
From albite + 'porphyre' (from Greek 'porphyra,' meaning purple), describing a volcanic rock with visible albite crystals in a fine-grained base.
Albitophyre reveals the cooling history of a volcano—large albite crystals formed slowly underground, then the magma rose quickly and cooled fast, leaving tiny crystals around them.
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