A type of igneous rock or mineral related to certain crystalline stone formations.
From Greek 'a-' (without) + an uncertain second element, possibly related to 'stoa' (stone). This is an obsolete or technical mineralogical term from 19th-century geology.
Most rocks have common names you'll recognize, but 'astite' is so obscure that even modern geologists might need to look it up—it's a word that lost the naming battle to its more popular cousins.
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