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Sample 85
NavDat sample number 20605 · PHONOLITE
Sample
| Sample ID | 85 |
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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, euhedral feldspathoids, scattered prismoids of sphene and pyroxene; rock is mostly a holocrystalline trachytic groundmass of prismoids of Na sanidine, shreds of aegirine, microlites of nepheline and hauyne, anhedral analcite and zeolites |
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Location
| Latitude | 42.765 |
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| Longitude | -107.29 |
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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 |
|
|
