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The telescope and collimator have each an object-glass consisting of a single lens of quartz 1½ inch diameter and a focal length of 18½ inches for the sodium yellow light, but not more than 16 inches for the highest rays measured.
Subsequently, the old Malay brought him the present specimen in a state of torpidity, telling him he had found it in a cavity of the quartz reef.
1948, Theodore Roethke, “The Shape of the Fire”, in The Lost Son and Other Poems; republished in The Collected Poems of Theodore Roethke, 1975, →ISBN, page 62:
My meat eats me. Who waits at the gate? / Mother of quartz, your words writhe into my ear. / Renew the light, lewd whisper.