Photomicrographs of dacite vitrophyre. Skamania County, Washington. 1980.
Dates
Date Taken
1980
Summary
Album caption: Photomicrographs of dacite vitrophyre. Plane polarized light; top edge of each published photomicrograph is 1.0 mm. B. Sample JDF-6-29-80-2. Pyroxene and plagioclase microlites strewn through a glassy matrix. The remainder of the section consists of vesicles (V) and orthopyroxene (O), plagioclase (P), and opaque oxide (black) phenocrysts. Skamania County, Washington. June 29, 1980. (Identification on published photo only) (Photo by J.D. Friedman) Portion published as figure 311-B in U.S. Geological Survey. Professional paper 1250. 1981. Index card unavailable.
Summary
Album caption: Photomicrographs of dacite vitrophyre. Plane polarized light; top edge of each published photomicrograph is 1.0 mm. B. Sample JDF-6-29-80-2. Pyroxene and plagioclase microlites strewn through a glassy matrix. The remainder of the section consists of vesicles (V) and orthopyroxene (O), plagioclase (P), and opaque oxide (black) phenocrysts. Skamania County, Washington. June 29, 1980. (Identification on published photo only) (Photo by J.D. Friedman) Portion published as figure 311-B in U.S. Geological Survey. Professional paper 1250. 1981.
Available in the U.S. Geological Survey Denver Library Photographic Collection, Mount St. Helens Collection.
Rights
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