|
| TABLE 3� | ||||
| VALUE OF U.S. GEMSTONE PRODUCTION, BY TYPE1 | ||||
| (Thousand dollars) | ||||
| Gem materials | 2005 | 2006 | ||
| Beryl | 48 | 21 | ||
| Coral, all types | 216 | 106 | ||
| Diamond | (2) | (2) | ||
| Garnet | 46 | 44 | ||
| Gem feldspar | 626 | 1,190 | ||
| Geode/nodules | 214 | 47 | ||
| Opal | 140 | 380 | ||
| Quartz: | ||||
| Macrocrystalline3 | 196 | 228 | ||
| Cryptocrystalline4 | 427 | 147 | ||
| Sapphire/ruby | 450 | 198 | ||
| Shell | 3,560 | 3,270 | ||
| Topaz | (2) | (2) | ||
| Tourmaline | 39 | 55 | ||
| Turquoise | 511 | 202 | ||
| Other | 6,960 | 5,440 | ||
| Total | 13,400 | 11,300 | ||
| 1Data are rounded to no more than three significant digits; may | ||||
| not add to totals shown. | ||||
| 2Included with "Other."� | ||||
| 3Macrocrystalline quartz (crystals recognizable with the naked | ||||
| eye) includes amethyst, amethyst quartz, aventurine, blue quartz, | ||||
| citrine, hawk's eye, pasiolite, prase, quartz cat's eye, rock crystal, | ||||
| rose quartz, smoky quartz, and tiger's eye. | ||||
| 4Cryptocrystalline (microscopically small crystals) includes agate, | ||||
| carnelian, chalcedony, chrysoprase, fossilized wood, heliotrope, | ||||
| jasper, moss agate, onyx, and sard. | ||||
Source: United States Geological Survey Mineral Resources Program