Sample: 91CND22
| Sample ID: | 91CND22 [1] | ||||||||||
| Station ID: | 91CND22 | ||||||||||
| AT Num: | |||||||||||
| Volcano: | Douglas | ||||||||||
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| Eruption: | |||||||||||
| Collector: | Nye, C. J. | ||||||||||
| Date sampled: | 1991-01-01 | ||||||||||
| Sample type 1: | Lava | ||||||||||
| Color: | |||||||||||
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| 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: |
  Legend ✕
300 km 200 mi |
