Sample: 91CND21
| Sample ID: | 91CND21 [1] |
| Station ID: | 91CND21 |
| AT Num: | |
| Volcano: | Douglas |
| Possible source: | |
| Eruption: | |
| Collector: | Nye, C. J. |
| Date sampled: | 1991-01-01 |
| Sample type 1: | Lava |
| Color: | |
| Final unit: | |
| Text Description: | Sample from base of flow between Spotted and striped glaciers. Porphyritic andesite. ~50% phenocrysts of plagioclase (typically 1.0 x 0.3 mm), and pyroxene (typically 1.1 x 0.4 mm), in a groundmass composed of about 50% brown glass and microphenocrysts on microlites of plagioclase, pyroxene, and opaque oxides. Pl:px ~ 3:2. A minority of the plagioclase phenocrysts have sieved zones, the rest are nearly free of disequilibrium textures. |
| Sample Location: |
