andesite

(andə zīt′)

noun

a dark-colored, fine-grained, extrusive igneous rock consisting chiefly of plagioclase feldspars with some biotite, hornblende, or pyroxene

Origin: after Andes (Mountains) + -ite

See andesite in American Heritage Dictionary 4

noun
A gray, fine-grained volcanic rock, chiefly plagioclase and feldspar.

Origin:

Origin: After the Andes

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