Sample: 79AMm 34
| Sample ID: | 79AMm 34 [1] |
| Station ID: | 79AMm 34 |
| AT Num: | |
| Volcano: | Gas Rocks, the |
| Possible source: | |
| Eruption: | |
| Collector: | Miller, T. P. |
| Date sampled: | 1979-01-01 |
| Sample type 1: | Other |
| Color: | light gray |
| Final unit: | |
| Text Description: | Hypabyssal plug of light-gray (N7) dacite porphyry. Phenocryst phases are hornblende, biotite, plagioclase (An 48), and quartz. Phenocrysts are dominated by plagioclase, and less abundant hornblende and biotite in a glassy groundmass. Quartz is in blebs although it appears primary. Plagioclase phenocrysts have overgrowths over corroded cores. Rock is partly vesicular. |
| Sample Location: |