Sodium-Rich Volcanic Rock

This page is the CodyCross answer for the clue below from Apothecary, Group 1976, Puzzle 3 (Licensed Drugs).

Question is: Sodium-Rich Volcanic Rock

and the answer is: ANDESITE

Word Meaning:

ANDESITE — (geology) Any of a class of fine-grained intermediate igneous rock, of volcanic origin, containing mostly plagioclase feldspar.

Definitions from Wiktionary.

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