andesine

Noun.  (mineralogy) sodium calcium aluminum silicate, (Na_xCa_xAlSi_3O_8), a plagioclase feldspar, the third member of the albite-anorthite solid solution series. Found in fine-grained andesite lavas; crystals are rarely seen.

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This entry was last updated on RefTopia from its source on 3/20/2012.