A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Phonolite, Beacon Hill, Cripple Creek, Colorado |
|---|---|
| Description | This specimen is a light gray, earthy-looking intrusive igneous rock. Although difficult to see in hand specimen, it contains feldspars (anorthoclase phenocrysts and orthoclase in the matrix), nepheline, and pyroxene (aegirine) as major minerals. This is 10 cm across. |
| Chronostratigraphy | Tertiary (Post-Oligiocene) |
| Location | USA ▹ Colorado ▹ Teller. Near Cripple Creek. Beacon Hill. |
| Photographer | Joseph Hartman. 2001-02-08. |
| Collection | Ward’s Collection of Classic North American Rocks #21. |
| Key words | phonolite, Colorado |
| Tech details | 796 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 32 |
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