Usage examples for quartz
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Frobenius thinks these were relics dating from past ages of culture, when the manipulation of quartz and granite was thoroughly understood and when iron manipulation gave evidence of a skill not met with to- day. – The Negro by W.E.B. Du Bois
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What's quartz diggin's, then? – Gold Seekers of '49 by Edwin L. Sabin
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The quartz veins also lie in this general course, one of which may be traced hundreds of miles. – Journal of a Trip to California by the Overland Route Across the Plains in 1850-51 by E. S. (Eleazer Stillman) Ingalls