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Fayalite in Cristobalite in Obsidian
- Coso Hot Springs, Coso District, Inyo Co., California, USA
- Small Cabinet, 7.1 x 4.0 x 3.6 cm
- Start Time: 12/25/2014 6:30:00 pm (CST)
- End Time: 01/06/2015 6:07:06 pm (CST)
- Auction Closed
Item Description
Amygdaloidal obsidian is the matrix for an open "egg" of light gray Cristobalite (a tetragonal polymorph of Quartz), which lines the inside. Perched aesthetically inside the Cristobalite vug are gemmy, yellow-green crystals of Fayalite, up to nearly 3 mm across. This is an end member of the Olivine group, of which the most famous member is Forsterite var. Peridot. Seldom do you see nice sharp (gemmy!) Fayalites. Fine geometry and aesthetics.