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Sample 21-26a
NavDat sample number 11117 · PHONOLITE
Sample
| Sample ID | 21-26a |
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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 | holocrystalline and distinctly porphyritic; aphanitic to fine grained groundmass of sanidine and anorthoclase microlites, natrolite compose 60 to 90% of rock; phenocrysts of sodalite, sanidine; also contains clinopyroxene and melanite garnet |
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Location
| Latitude | 44.4808 |
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| Longitude | -104.437 |
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| Location | Bear Lodge Mountains |
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| State / province | Wyoming |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 44 |
|
38 |
50 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 44.37 | | WT% | XRF |
| AL2O3 | 19.83 | | WT% | XRF |
| FE2O3T | 3.24 | | WT% | XRF |
| MGO | 0.17 | | WT% | XRF |
| CAO | 1.7 | | WT% | XRF |
| NA2O | 4.93 | | WT% | XRF |
| K2O | 8.35 | | WT% | XRF |
| TIO2 | 0.23 | | WT% | XRF |
| P2O5 | 0.02 | | WT% | XRF |
| MNO | 0.17 | | WT% | XRF |
| TOTAL | 83.01 | | WT% | XRF |
