A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Biotite-Hornblende granite from St. Cloud, Minnesota |
|---|---|
| Description | The area around St. Cloud Minnesota is well known for its granite quarries that produce building and monument stone. This is a very coarse grained granite with large pale pink K-feldspar (microcline) crystals that provide the porphyritic character. Small gray plagioclase (oligoclase), quartz, biotite, and hornblende are easily seen. This is a plutonic igneous rock. It is 10 cm across. |
| Chronostratigraphy | Post Archean (Probably Keweenawan) |
| Geologic province | Minnesota River Valley Precambrian |
| Location | USA ▹ Minnesota ▹ Stearns. Near St. Cloud. |
| Photographer | Dexter Perkins. 2001-01-25. |
| Collection | Ward’s Collection of Classic North American Rocks #3. |
| Key words | granite, Minnesota, St. Cloud |
| Tech details | 1002 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens. |
| GeoDIL number | 21 |
 | |