A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Hypersthene gabbro |
|---|---|
| Description | This hand specimen is typical of a gabbro: a dense dark rock composed of grains of pyroxene (dark) and plagioclase (light) up to 1 cm across. Thin section viewing also reveals the presence of hornblende, biotite and magnetite. In thin section, however, the dominant pyroxene appears to be hypersthene (not the standard augite that defines a gabbro). Ward’s Scientific calls this a hypersthene gabbro, but a more appropriste name might be norite or gabbronorite. The specimen is about 9 cm across. |
| Chronostratigraphy | Proterozoic |
| Geologic province | Grenville |
| Location | USA ▹ New York ▹ Essex. Adirondack Mountains. |
| Photographer | Darla Sondrol. 2001-05-15. |
| Collection | Ward’s University Rock Collection #124. |
| Key words | gabbror, hypersthene, norite, gabbronorite, Adirondack Mountains |
| Tech details | 918 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera, 60mm AF Nikon micro lens. |
| GeoDIL number | 452 |
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