Bruneau jasper is a variety of the mineral jasper. It is a "picture jasper" – a jasper that exhibits particular patterns and colors – and is used as an opaque gemstone.
The stone exhibits layered patterns of brown, reddish brown and cream color, [1] or sometimes of red and green color. [2] It was discovered in the Bruneau River canyon in Idaho, [1] near the bottom of the canyon walls, [2] where the rhyolite in which the jasper occurs is exposed for a length of 8 kilometres (5.0 mi). [3]
As of 2009 Bruneau jasper was no longer in production, and was difficult to locate. [1]
References
- ^ a b c Collings, Michael R. (2009). Gem lore: an introduction to precious and semi-precious stones (2nd ed.). Rockville, Md.: Borgo Press. p. 85. ISBN 9781434457028.
- ^ a b Beckwith, John A. (2007). Gem minerals of Idaho. Caldwell, Idaho: Caxton Press. p. 38. ISBN 9780870042287.
- ^ Bonnichsen, Bill; Kauffman, Daniel F. (1987). "Physical features of rhyolite lava flows in the Snake River Plain volcanic province, southwestern Idaho". Geological Society of America Special Papers (212): 122. CiteSeerX 10.1.1.832.9736.
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