An archaic or alternative spelling of andesite, the volcanic rock.
An older variant spelling of andesite, using -yte instead of -ite; -yte was an earlier suffix used in geological naming before standardization to -ite occurred.
Early geology was so unsystematized that the same rock could be spelled multiple ways until scientists agreed on standard nomenclature—andesyte vs. andesite is a fossil of that chaos.
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