A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Alkalic granite from Quincy, Massachusetts |
|---|---|
| Description | This is a dark gray granular intrusive igneous rock. It is an atypical granite and consists of K-feldspar, quartz, sodic amphiboles, and pyroxene (aegirine). The dark greenish color is not typical of granites; they are generally pink to white. This sample is about 10 cm across. |
| Chronostratigraphy | Carboniferous (Probably Mississippian) |
| Geologic province | Quincy Granite |
| Location | USA ▹ Massachusetts ▹ Norfolk. Near Quincy. |
| Photographer | Dexter Perkins. 2001-01-25. |
| Collection | Ward’s Collection of Classic North American Rocks #4. |
| Key words | granite, intrusive, igneous, Massachusetts |
| Tech details | 656 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 22 |
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