andesite /ˈandɪzʌɪt, ˈandɪsʌɪt/

a

I. noun [ mass noun]

1.
[Geology] a dark, fine-grained, brown or greyish intermediate volcanic rock which is a common constituent of lavas in some areas.
II. derivatives

andesitic
adjective


– origin mid 19th cent.: named after the Andes mountains, where it is found + -ite1.

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