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Sample 88
NavDat sample number 20604 · TRACHYTE
Sample
| Sample ID | 88 |
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| Rock name | TRACHYTE |
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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 feldspar and elongate pyroxene, needles of amphibole, prismoids of sphene; holocrystalline trachytic groundmass of prismoids of Na orthoclase, aegirine-augite needles with some tridymite; also biotite, magnetite, sphene, apatite, and zircon |
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Location
| Latitude | 42.7412 |
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| Longitude | -107.323 |
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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 |
|
|
