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Sample 74
NavDat sample number 20602 · PHONOLITE
Sample
| Sample ID | 74 |
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| Rock name | PHONOLITE |
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| Rock type | VOLCANIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | coarsely porphyritic; phenocrysts of tabular feldspar, anhedral feldspathoids; prismoids of sphene and pyroxene; groundmass is holocrystalline trachytic and composed of Na sanidine, aegirine needles, and cubes and hexagons of nepheline and sodalite |
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Location
| Latitude | 42.7621 |
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| Longitude | -107.322 |
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| Location | Rattlesnake Hills |
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| State / province | Wyoming |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 38 |
|
32 |
44 |
|
|
