: a usually light-colored volcanic rock consisting chiefly of potash feldspar
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Now, after years of protests and problems, the city has decided to replace the translucent glass with less slippery — and less glamorous — trachyte stone.—New York Times,
2 Jan. 2022 Some samples preserve more of the mixing, thus contain the trachyte.—
Erik Klemetti,
Discover Magazine,
28 Nov. 2011