Bruneau jasper

{{Short description|Variety of the mineral jasper}}

File:Bruneau Jasper from Idaho Thundereggs.jpg

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,{{cite book |last1=Collings |first1=Michael R. |title=Gem lore: an introduction to precious and semi-precious stones |date=2009 |publisher=Borgo Press |location=Rockville, Md. |isbn=9781434457028 |page=85 |edition=2nd}} or sometimes of red and green color.{{cite book |last1=Beckwith |first1=John A. |title=Gem minerals of Idaho |url=https://archive.org/details/gemmineralsofida00beck |url-access=registration |date=2007 |publisher=Caxton Press |location=Caldwell, Idaho |page=[https://archive.org/details/gemmineralsofida00beck/page/n91 38]|isbn=9780870042287}} It was discovered in the Bruneau River canyon in Idaho, near the bottom of the canyon walls, where the rhyolite in which the jasper occurs is exposed for a length of {{convert|8|km|mi}}.{{cite journal |last1=Bonnichsen |first1=Bill |last2=Kauffman |first2=Daniel F. |title=Physical features of rhyolite lava flows in the Snake River Plain volcanic province, southwestern Idaho |journal=Geological Society of America Special Papers |date=1987 |issue=212 |page=122 |citeseerx=10.1.1.832.9736 }}

As of 2009 Bruneau jasper was no longer in production, and was difficult to locate.