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Sample 18
NavDat sample number 11379 · PHONOLITE
Sample
| Sample ID | 18 |
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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 with hiatal texture between cm and mm scale sanidine phenocrysts; trachytic holocrystalline matrix of Na sanidine, aegirine, and feldspathoid; phenocrysts of feldspathoid, sanidine, clinopyroxene, and minor magnetite and occasional amphibole |
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Location
| Latitude | 42.7389 |
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| Longitude | -107.306 |
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| Location | Rattlesnake Hills |
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| State / province | Wyoming |
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| Volcanic field | Group A phonolite |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 43.6 |
|
41.4 |
46.6 |
|
|
