 | | Journal (article/letter/editorial) | | Arizona 85287, USA 1 Department of Geology, University of Iowa, Iowa City, Iowa 52242, USA z Applied Geologic...Geologic Studies, Englewood, Colorado 80110, USA ,Abstract. High-silica topaz-bearing rhyolites of Cenozoic...Cenozoic age are widely distributed across the western USA and Mexico. They are characteristically enriched...topaz, the rhyolites contain garnet, bixbyite, pseudobrookite, hematite and fluorite in cavities or in their...contain F e - M n garnet, beryl, bixbyite, pseudobrookite, hematite and fluorite in miarolitic cavities |  | Burt, Donald M., Sheridan, Michael F., Bikun, James V., Christiansen, Eric H. (1982) Topaz rhyolites; distribution, origin, and significance for exploration. Economic Geology, 77 (8) 1818-1836 doi:10.2113/gsecongeo.77.8.1818 | Journal (article/letter/editorial) | | commonlyassociated with MnFe garnet, bixbyite, pseudobrookite, specularite,quartz, and other minerals.In...ColoradoPlateau (in Colorado,New Mexico, Arizona, Utah, and Nevada) and in Idaho and Montana. They alsooccur...volcanogenic depositsof Be, U, Sn,and F. SporMountain,Utah, providesthe bestexample of this type of mineralization...km westof what would84 years from the ThomasRange,Utah, where topazwasfirst laterbecomethe Climaxmolybdenummine...percentF; somevitrophyres,suchasthosefrom SporMountain,Utah,contain more than 1.0 percentF (Bikun, 1980). Glassy |  | | Book | | indebted. Appreciation is also expressed to Dr J. Arem, USA; Sr Carlos Barbosa, Brazil; Professor J. Cassedanne...Canada; Mr T. Michalski, USA; Mr J. Murphy, USA; Dr F. Pough, USA; Mrs K. Robertson, USA; Dr W. Sersen, Thailand;...Thailand; Mr M. Sonsthagen, USA; A. Theisen, USA; John White, USA; and many others in the trade who assisted...throughout the world. Brown - topaz rhyolites in western USA, and Mexico. Many pegmatites throughout the world...has an estimated weight of 350 000 kg (Millard, 1944). Millard does not give the colour of this giant |
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Smelter Knolls, Millard County, Utah, USA