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Quartz to diamonds.
Colored Stone 1992 Jan; 5(3):26-27
Since the U.S. Bureau of Mines expanded its survey of gemstone producers in 1986, Arkansas has ranked as high as second in the value of gemstones produced, a ranking that it enjoyed in 1989 and 1990, and as low as fifth in 1991. The remaining 3 years, 1986, 1987, and 1988 the state ranked fourth. Over the years, Arkansas and quartz have been synonymous. Not only is Arkansas the major producer of gemstone and decorative quartz, but it is the only producer of "lacas," the feed material used to make synthetic quartz.
OP; Journal Article
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Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division