|
| TABLE 3- | ||||||||
| ESTIMATED VALUE OF U.S. NATURAL GEMSTONE PRODUCTION, | ||||||||
| BY GEM TYPE1 | ||||||||
| (Thousand dollars) | ||||||||
| Gem materials | 2012 | 2013 | ||||||
| Beryl | 1,790 | 191 | ||||||
| Coral, all types | 150 | 138 | ||||||
| Diamond | (2) | (2) | ||||||
| Garnet | 98 | 92 | ||||||
| Gem feldspar | 757 | 698 | ||||||
| Geode/nodules | 89 | 89 | ||||||
| Opal | 74 | 93 | ||||||
| Quartz: | ||||||||
| Macrocrystalline3 | 383 | 384 | ||||||
| Cryptocrystalline4 | 261 | 199 | ||||||
| Sapphire/ruby | 360 | 266 | ||||||
| Shell | 810 | 695 | ||||||
| Topaz | (2) | (2) | ||||||
| Tourmaline | 99 | 94 | ||||||
| Turquoise | 1,320 | 1,310 | ||||||
| Other5 | 5,140 | 5,330 | ||||||
| Total | 11,300 | 9,570 | ||||||
| 1Data are rounded to no more than three significant digits; may not add to | ||||||||
| totals shown. | ||||||||
| 2Less than - unit. | ||||||||
| 3Macrocrystalline quartz (crystals recognizable with the naked eye) includes- | ||||||||
| amethyst, aventurine, blue quartz, citrine, hawk-s eye, pasiolite, prase, quartz- | ||||||||
| cat-s eye, rock crystal, rose quartz, smoky quartz, and tiger-s eye.- | ||||||||
| 4Cryptocrystalline quartz (microscopically small crystals) includes agate, | ||||||||
| carnelian, chalcedony, chrysoprase, fossilized wood, heliotrope, jasper, moss- | ||||||||
| agate, onyx, and sard. | ||||||||
| 5Includes jade, pearl, and many other gemstone types. | ||||||||
Source: United States Geological Survey Mineral Resources Program
See also: Mineral commodity prices
