A type of volcanic rock formed from the devitrification of rhyolite glass; a crystalline rock derived from formerly glassy volcanic material.
From apo- (away from) + rhyolite (a fine-grained volcanic rock). The prefix indicates a rock formed by alteration away from the original rhyolitic glass state through geological processes.
When volcanic glass sits in the ground for thousands of years, it slowly crystallizes into aporhyolite—it's like nature's slow-motion version of cooking, where heat and time gradually transform transparent glass into solid rock.
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