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Sample VHSW-3N
NavDat sample number 5517 · TRACHYANDESITE
Sample
| Sample ID | VHSW-3N |
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| Rock name | TRACHYANDESITE |
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| Rock type | VOLCANIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | Dark-gray fine-grained vesicular rock composed of 7-8 percent euhedral to subhedral plagioclase Anapproximately60, 2-3 percent subhedral olivine, 2 percent subhedral pigeonite, and <1.0 percent magnetite phenocrysts in a felty to pilotaxitic groundmass composed of 50-55 percent plagioclase laths, 20 percent olivine and pyroxene, 5-10 percent glass heavily dusted with opaque material, 5 percent magnetite, <1 percent accessory apatite. Vesicles, sometimes filled with calcite, compose 1-20 percent of the rock. |
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Location
| Latitude | 32.2783 |
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| Longitude | -111.702 |
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| Location | Pima County |
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| State / province | Arizona |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 22.8 |
|
21.7 |
23.9 |
|
|
