trachyte

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trachyte Fine-grained volcanic rock of the alkaline series of intermediate rocks. Trachyte is the volcanic equivalent of syenite.

trachyte

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trachyte gritty volcanic rock. XIX. — F., f. Gr. trākhús rough or trākhútēs roughness.

trachyte

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trachyte. Volcanic rock consisting mostly of sanidine felspar.