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Rhyolite, result 1 of 1
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United States of America
obsidian containing quartz, plagioclase feldspar, and alkali feldspar vitrophyres; highly vitrophyric; medium-grained vitrophyres; obsidian groundmass; hypohyaline
Taylor Science Center Rm. 1033
Western Minerals, Inc.
Boulder Batholith in MT.
medium-grained (1-5 mm)
Rock Color Index
Route 12, 0.5 miles west of Elliston, MT.
Becraft et al. (1963); Ruppel (1963); Pardee and Schrader (1933); Robertson (1953); Robertson (1962)
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