Cristobalite, Fayalite, Obsidian
Unknown Owner
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A visual and showy specimen of a 2.5 cm "eye" of high-temperature cristobalite nicely set in highly lustrous, jet-black obsidian from an uncommon California locale - the Couger Butte, Siskiyou County. The "eye" has three clusters of gemmy, olive-green, micro-blades of fayalite, an olivine group mineral. Obsidian (volcanic glass) cools too quickly to crystallize. Thus, it is unusual to see minerals attached. The "eyes" or spheres of high temperature cristobalite (SiO2) are actually the result of devitrification, or loss of silica from the obsidian.
Product details
SpeciesObsidian, Cristobalite, Fayalite
SizeSmall Cabinet
Dimensions5.8 x 5.8 x 4.4 cm
Added on10/23/2024
LocalityUSA, California
Known provenance
| Date | Collector | Acquisition price |
|---|---|---|
| 08/2024 | Unknown Owner | Not disclosed |
| — | The Arkenstone | Not disclosed |
Comments