A Geoscience Digital Image Library
A Geoscience Digital Image Library
| Title | Thin section of phonolite |
|---|---|
| Description | This is a plain polarized thin section of phonolite. The few phenocrysts are tablets of anorthoclase (“Moire-type” extinction). The trachytic-textured matrix consists of parallel thin orthoclase crystals, stubby nepheline euhedra and aegirine microlites in plumose clusters. Accessories are magnetite, pyrite and analcime. |
| Chronostratigraphy | Tertiary (Post-Oligocene) |
| Location | USA ▹ Colorado ▹ Teller. Near Cripple Creek. Beacon Hill. |
| Photographer | Darla Sondrol. 2002-04-08. |
| Collection | Ward’s Collection of Classic North American Rocks #21. |
| Key words | phonolite, Colorado, thin section |
| Tech details | 1.06 MB. Thin section. Nikon FDX-35. |
| GeoDIL number | 2621 |
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