← Search
Sample BL-13A
NavDat sample number 8435 · FELSITE
Sample
| Sample ID | BL-13A |
|---|
| Rock name | FELSITE |
|---|
| Rock type | PLUTONIC |
|---|
| Composition | FELSIC |
|---|
| Material | IGNEOUS |
|---|
| Comment | porphyritic with aphanitic groundmass; groundmass varies from strongly trachytic to pilotaxitic, composed of primary alkali feldspar, plagioclase, feldspathoid, pyroxene, sphene; secondary muscovite, clay, orthoclase, calcite, zeolites, quartz, oxides; phenocrysts of alkali feldspar, plagioclase ? |
|---|
Location
| Latitude | 44.4503 |
|---|
| Longitude | -104.439 |
|---|
| Location | Bear Lodge Mountains, Houston Creek area |
|---|
| State / province | Wyoming |
|---|
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 43.9 |
|
36.7 |
51.1 |
|
|
