RhymeZone: andesine definitions

Definitions of 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.

(Definitions from Wiktionary)