A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Thin section of hornblende gabbro |
|---|---|
| Description | This is a cross polarized thin section of hornblende gabbro. An equiangular rock consisting of subhedral labradorite tablets and somewhat subordinate mafics augite, hornblende, magnetite in anhedral clustered grains. The plagioclase shows narrow marginal zoning. The augite is strongly uralitized by olive green hornblende. The opaques are an intergrowth of predominant granular magnetite and subordinate pyrite. Other accessories are biotite, apatite, and chlorite, the last replacing hornblende. |
| Chronostratigraphy | Cretaceous |
| Geologic province | San Marcos Gabbro |
| Location | USA ▹ California ▹ San Diego. Near Escondido. |
| Photographer | Darla Sondrol. 2002-04-09. |
| Collection | Ward’s Collection of Classic North American Rocks #28. |
| Key words | hornblende gabbro, hornblende, gabbro, California, thin section |
| Tech details | 2.31 MB. Thin section. Nikon FDX-35. |
| GeoDIL number | 2636 |
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