| AllMinerals/JohnBetts-FineMinerals > Online Mineral Museum Photographic Archive > Minerals from California > Cristobalite and Fayalite in Obsidian |
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| DESCRIPTION: | No. 61467 |
| Mineral: | Cristobalite and Fayalite in Obsidian |
| Locality: | Cougar Butte, Siskiyou County, California |
| Description: | Shiny black obsidian with spherical gas cavities lined with gray cristobalite hemispherical aggregates to 0.2 mm diameter plus microscopic dark fayalite crystals. The black obsidian exhibits classic conchoidal surfaces. |
| Overall Size: | 9x7x6 cm |
| Crystals: | micro |
| Archived: | For reference only |
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