Sample: Barth_1956_9
| Sample ID: | Barth_1956_9 [1] |
| Station ID: | Barth_1956_9 |
| AT Num: | |
| Volcano: | St. Paul Island |
| Possible source: | |
| Eruption: | |
| Collector: | Barth, T. F. W. |
| Date sampled: | 1948-01-01 |
| Sample type 1: | Lava |
| Color: | |
| Final unit: | |
| Text Description: | Sample of a holocrystalline flow of aphyric basanite. The rock is very fine grained; rare microphenocrysts of plagioclase and pyroxene are seen. The groundmass shows sharp, small euhedral crystals of olivine, and very small crystals of pyroxene. The plagioclase laths average 0.02 x 0.0015 mm and show a vague preferred orientation. Feldspars range from An55 to An35, with an average composition of An40. |
| Sample Location: |
References Cited
[1] Geology and petrology of the Pribilof Islands, Alaska, 1956
Barth, T. F. W., 1956, Geology and petrology of the Pribilof Islands, Alaska: in Investigations of Alaskan volcanoes, U.S. Geological Survey Bulletin 1028-F, p. 101-160, 2 sheets, scale unknown.
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