Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Opal from
Barnes Butte (Prineville Quicksilver), Howard Mining District (Ochoco Mining District; Bolivar Mining District), Crook County, Oregon, USA


07476470017364557282897.jpg
Opal

Barnes Butte, Howard Mining District, Crook County, Oregon, USA
01629570017364557294721.jpg
Opal

Barnes Butte, Howard Mining District, Crook County, Oregon, USA
07324400017272077646198.jpg
Opal

Barnes Butte, Howard Mining District, Crook County, Oregon, USA
01810680017272058097052.jpg
Opal

Barnes Butte, Howard Mining District, Crook County, Oregon, USA
07324400017272077646198.jpg
Opal

Barnes Butte, Howard Mining District, Crook County, Oregon, USA
01810680017272058097052.jpg
Opal

Barnes Butte, Howard Mining District, Crook County, Oregon, USA
Locality type:Table/Butte
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Cinnabar3
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Barnes Butte (Prineville Quicksilver), Howard Mining District (Ochoco Mining District; Bolivar Mining District), Crook County, Oregon, USA
Photo GalleryView Gallery (2 photos)
Data Identifiers
Mindat Occurrence Record ID:470516
Long-form Identifier:1:3:470516:1
GUID (UUID V4):0
Nearest other occurrences of Opal
26.7km (16.6 miles) ⓘJimmy Ann (Beardssmore; Stanley & Culbertson; Staley; Ochoco Mines Corp.; Ochoco Quicksilver Champion; Barney and Staley), Howard Mining District (Ochoco Mining District; Bolivar Mining District), Crook County, Oregon, USA
32.1km (19.9 miles) ⓘPost, Crook County, Oregon, USA
36.7km (22.8 miles) ⓘMother Lode (American Almaden; Consolidated Quicksilver; Canyon Creek), Howard Mining District (Ochoco Mining District; Bolivar Mining District), Crook County, Oregon, USA
46.0km (28.6 miles) ⓘRound Butte Cinder Pit, Jefferson County, Oregon, USA
46.9km (29.2 miles) ⓘRichardson Ranch, Madras, Jefferson County, Oregon, USA
48.0km (29.8 miles) ⓘThunderegg Deposit, Pony Butte, Jefferson County, Oregon, USA
48.3km (30.0 miles) ⓘPolka Dot Agate mine, Jefferson County, Oregon, USA
74.8km (46.5 miles) ⓘNewberry Caldera, Newberry National Volcanic Monument, Deschutes County, Oregon, USA
References
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
 
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