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Sample 91-168
NavDat sample number 36171 · RHYOLITE
Sample
| Sample ID | 91-168 |
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| Rock name | RHYOLITE |
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| Rock type | VOLCANIC |
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| Composition | FELSIC |
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| Material | IGNEOUS |
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| Comment | medium-gray, porphyritic; found in Archean gneiss; microcrystalline matrix of devitrified glass; some feldspar phenocrysts are altered to carbonate and clay |
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Location
| Latitude | 44.8917 |
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| Longitude | -112.942 |
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| State / province | Montana |
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| Volcanic field | Challis Volcanic Group |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 52.99 |
|
52.86 |
53.12 |
|
|
Analyses
No chemical analyses are stored for this sample.
