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Sample R-7
NavDat sample number 4156 · RHYOLITE
Sample
| Sample ID | R-7 |
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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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| Collected by | M.L. Silberman, U.S. Geological Survey |
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| Comment | The rock consists of altered porphyritic rhyolite, recrystallized to an assemblage of sericite, quartz, K-feldspar and limonite after pyrite. K-feldspar occurs largely in groundmass with quartz and fine-grained mica. Feldspar phenocrysts are now largely sericite and quartz. Original mica flakes, probably biotite, now consist of muscovite lamellea, with iron oxide -- coarser than the groundmass K-mica. |
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Location
| Latitude | 39.0167 |
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| Longitude | -118.393 |
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| Location | Mineral County, NV |
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| State / province | Nevada |
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| Location comment | portal of adit, Yellowstone tunnel, E end of Hooligan Hill within Rawhide townsite |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 15.9 |
|
15.4 |
16.4 |
|
M.L. Silberman, U.S. Geological Survey |
Analyses
No chemical analyses are stored for this sample.
