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Sample 82-Anhy
NavDat sample number 10025 · RHYOLITE
Sample
| Sample ID | 82-Anhy |
|---|
| Rock name | RHYOLITE |
|---|
| Rock type | VOLCANIC |
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| Composition | FELSIC |
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| Material | IGNEOUS |
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| Comment | Dense black glassy rock which is totally devoid of phenocrysts. Groundmass is hyalopilitic, randomly oriented feldspar microlites set in fresh clear glass. |
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Location
| Latitude | 41.6173 |
|---|
| Longitude | -121.524 |
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| State / province | California |
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| Volcanic field | Medicine Lake Highland |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 0.05 |
|
0.04 |
0.06 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 70.62 | | WT% | XRF |
| AL2O3 | 14.83 | | WT% | XRF |
| FEO | 1.76 | | WT% | XRF |
| FE2O3 | 0.89 | | WT% | XRF |
| TIO2 | 0.5 | | WT% | XRF |
| MNO | 0.05 | | WT% | XRF |
| MGO | 0.62 | | WT% | XRF |
| CAO | 1.93 | | WT% | XRF |
| NA2O | 3.76 | | WT% | XRF |
| K2O | 4.46 | | WT% | XRF |
| P2O5 | 0.11 | | WT% | XRF |
