A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Rhyolite Porphyry, Chafee County, Colorado |
|---|---|
| Description | This specimen is a gray, porphyritic rock, somewhat vesicular, with prominent phenocrysts of smoky quartz averaging 5mm in width and subhedral to euhedral phenocrysts of glassy feldspar averaging 4mm in length. Tiny garnet and topaz crystals occur in some vesicles. The sample is 11 cm wide. |
| Chronostratigraphy | Tertiary |
| Location | USA ▹ Colorado ▹ Chafee |
| Photographer | Joseph Hartman. 2001-02-13. |
| Collection | Ward’s Collection of Classic North American Rocks #12. |
| Key words | rhyolite porphyry, rhyolite, Colorado |
| Tech details | 782 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 53 |
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