A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Quartz Monzonite Porphyry, Garfield, Chaffee County, Colorado |
|---|---|
| Description | This is a gray porphyritic rock with phenocrysts of pink K-feldspar up to an inch long. Smaller phenocrysts include plagioclase feldspar, quartz, hornblende and mica. The sample is 8.5 cm across. |
| Chronostratigraphy | Tertiary |
| Location | USA ▹ Colorado ▹ Chaffee. Near Garfield. |
| Photographer | Twyla Baker. 2001-02-14. |
| Collection | Ward’s Collection of Classic North American Rocks #6. |
| Key words | monzonite, porphyry, Colorado |
| Tech details | 980 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 64 |
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