Manganoan fayalite [(Fe,Mn){sub 2}SiO{sub 4}]: A new occurrence in rhyolitic ash-flow tuff, southwestern Nevada, U.S.A.
Journal Article
·
· American Mineralogist
OSTI ID:138374
- Michigan State Univ., East Lansing (United States)
Manganoan fayalite is usually found associated with sedimentary iron-manganese ore deposits. Phenocrysts of manganoan fayalite were recently discovered in high-silica rhyolite pumice fragments from the Ammonia Tanks Member of the Timber Mountain Tuff in the Southwestern Nevada Volcanic Field. Twenty-one electron microprobe analyses (major-element oxides, NiO, BaO) are reported for the newly discovered phenocrysts. The slightly zoned phenocrysts range in composition from Fa{sub 63}Fo{sub 0}Te{sub 37}La{sub 0.2} to Fa{sub 72}Fo{sub 0.2}Te{sub 28}La{sub 0.1}.
- OSTI ID:
- 138374
- Journal Information:
- American Mineralogist, Vol. 76, Issue 1-2; Other Information: PBD: Jan-Feb 1991
- Country of Publication:
- United States
- Language:
- English
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