One of the mysteries of the English language finally explained.
A feldspar occurring chiefly as white or colourless crystals in volcanic rocks, subsequently identified with sanidine.
Mid 19th century. From German Ryakolith from ancient Greek ῥυακ-, ῥύαξ mountain-stream, lava-stream + German -o- + -lith, with remodelling of the ending after -lite.
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