† quartz-boiln. [ < quartzn. + boiln.2, in specific use in Australian English in sense ‘mineral outcrop’] AustralianMiningObsoleterare an outcrop of a quartz reef.
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1869 R. B. SmythGold Fields Victoria 618Quartz-boil, an outcrop of a quartz reef on the surface, or an outburst or extension in width of the reef beneath it.