Sample: 91CND12
| Sample ID: | 91CND12 [1] | ||||||||||
| Station ID: | 91CND12 | ||||||||||
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| Volcano: | Douglas | ||||||||||
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| Collector: | Nye, C. J. | ||||||||||
| Date sampled: | 1991-01-01 | ||||||||||
| Sample type 1: | Lava | ||||||||||
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| Text Description: | Sample of block of dense glassy pyroclast. Similar blocks, radially fractured and up to ~80 cm, litter the surface of this ridge, rather than coming from a unit in section, and are thus presumably very young. Porphyritic two-pyroxene dacite with ~40% phenocrysts and glomerocrysts (individual pyroxene and plagioclase crystals typically 1.0 x 0.3 mm) in a groundmass of clear glass with only minor microlites. Conchoidal fractures in the glass suggest collapse of former vesicles. This is the only Douglas sample collected in 1991 with abundant glass. | ||||||||||
| Sample Location: |
  Legend ✕
300 km 200 mi |
