isolated in pure form (Bureau of
             Mines 1980, 105). Boron minerals were discovered in Chile in 1852, and during the latter half of the 19th century, Chile enjoyed a period as principal world producer (Bureau of Mines 1980, 105). Turkish deposits, although worked in ancient times, underwent modern developments in 1865 (Bureau of Mines 1980, 105). More recent discoveries have increased Turkey's potential to rival the United States as a world supplier. In the United States, the first of four eras of commercial production began in 1864 with the recovery of borax crystals from mineral springs and lakes north of San Francisco (Bureau of Mines 1980, 105). Intensive exploration during the 1870's and 1880's resulted in successive discoveries of marsh deposits in the deserts of Nevada and California (Bureau of Mines 1980, 105). The first commercially profitable deposit of crystalline borax was discovered in 1872 at Teels Marsh, Nevada, shortly after another boron mineral, ulexite, and been found nearby (Bureau of M!
             ines 1980, 106). Similar surface depo
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