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Sample BL-91
NavDat sample number 8358 · PHONOLITE
Sample
| Sample ID | BL-91 |
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| Rock name | PHONOLITE |
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| Rock type | PLUTONIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | holocrystalline; porphyritic with phenocrysts of sanidine, nepheline, salite, magnetite, sphene, apatite, melanite, and biotite; groundmass composed of alkali feldspar microlites with trachytic texture |
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Location
| Latitude | 44.4635 |
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| Longitude | -104.418 |
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| Location | Warren Peaks area of Bear Lodge Mountains |
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| State / province | Wyoming |
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| Volcanic field | Bear Lodge intrusive complex |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 50.5 |
|
49.3 |
51.7 |
|
|
