Sample: 91CND22
| Sample ID: | 91CND22 [1] |
| Station ID: | 91CND22 |
| 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 isolated lava outcrop at 200 ft elevation in striped glacier valley Porphyritic andesite. ~60% phenocrysts and microphenocrysts of plagioclase (up to 1.0 x 0.3 mm), and pyroxene (typically 0.6 x 0.3 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: |
