Assertion: borax | /r/CapableOf | turn up in large and purer quantities
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text: Borax was first produced commercially in the United States in California at Clear Lake north of San Francisco, from about 1864 to 1868, at which place the industry flourished until the early 1870s when borax began to turn up in large and purer quantities in several of the alkaline marshes of eastern California and western Nevada — notably around Columbus and Teel’s Marsh.