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Uranoan thorite in lithophysal rhyolite - Topaz Mountain, Utah, U.S.A.

Mineralogical Magazine

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Abstract

Uranoan thorite (SiO2 17.3, ThO2 56.8, UO2 25.4, = 99.5) occurs as a sparse constituent in lithophysae in alkali rhyolite flows (6.1-6.8 m.y.) on the flank of Topaz Mt in the Thomas Range; it is associated with sanidine, quartz, topaz, hematite, magnetite and calcite. The uranoan thorite forms euhedral, dark grass-green crystals; it is isotropic with n 1.86. This appears to be the first reported occurrence of thorite in rhyolitic volcanic rocks, but may account for part or all of the Th reported in alkali rhyolites.-R.A.H.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Uranoan thorite in lithophysal rhyolite - Topaz Mountain, Utah, U.S.A.
Series title:
Mineralogical Magazine
Volume
49
Issue:
5
Year Published:
1985
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Mineralogical Magazine
First page:
729
Last page:
731