Sample: 91CND07
| Sample ID: | 91CND07 [1] |
| Station ID: | 91CND07 |
| 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: | Very dark gray lava in older volcanics. Geodes and ruby red plagioclase indicate alteration and silica mobilization. Not much fresh rock in immediate area. Porphyritic two-pyroxene dacite. ~25% phenocrysts of plagioclase (up to 1.0 x 0.4 mm), pyroxene (0.8 x 0.3 mm), and opaque Fe-Ti oxides in a matrix of devitrified glass and subordinate microphenocrysts and microlites. Pl:px ~ 3:2 |
| Sample Location: |
