A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Camptonite, Hoover Dam, Arizona, USA |
|---|---|
| Description | Camptonites are rare but are similar in major element composition to diorite. They are a type of lamprophyre (a term used to refer to dark-colored fine-grained porphyritic intrusive rocks containing euhedral mafic phenocrysts), and typically contain plagioclase and hornblende. In this sample, the phenocrysts are altered hornblende and plagioclase. The fine grained groundmass contains plagioclase, biotite and other material that cannot be identified. |
| Location | USA ▹ Arizona. Hoover Dam. |
| Photographer | Nessa Eull. 2001-05-14. |
| Collection | Ward’s Collection of Classic North American Rocks #121. |
| Key words | camptonite, Arizona, lamprophyre |
| Tech details | 645 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 449 |
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