The word of the day is andesite:
A gray, fine-grained volcanic rock. Andesite consists mainly of sodium-rich plagioclase and one or more mafic minerals such as biotite, hornblende, or pyroxene. It often contains small, visible crystals (phenocrysts) of plagioclase. It is the fine-grained equivalent of diorite.
1840-50; named after Andes (dictionary.com)
"McInerney showed him pictures of andesite.
"'Local rock?' Ban wanted to know.
"McInerney and Maltz had a long conversation about wood, rocks, glass, sun, and snow, during which they excitedly presented Ban with images on cameras, phones, and an iPad, and in the project book for McInerney's site."
- Dana Goodyear, "Paper palaces: the architect of the dispossessed meets the one per cent", 11 & 18 The New Yorker
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