Sample: 81ARj 13
| Sample ID: | 81ARj 13 [1] |
| Station ID: | 81ARj 13 |
| AT Num: | |
| Volcano: | Ugashik caldera |
| Possible source: | |
| Eruption: | |
| Collector: | Riehle, J. R. |
| Date sampled: | 1981-01-01 |
| Sample type 1: | Lava |
| Color: | |
| Final unit: | |
| Text Description: | Porphyritic hornblende-biotite dacite. Flow-foliated glassy groundmass contains rounded phenocrysts of plagioclase and quartz. Dominant mafic is dark-green hornblende, lesser biotite, and sparse orthopyroxene. Plagioclase (An 54) is generally Carlsbad twinned, but has rare albite twins. |
| Sample Location: |