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
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


Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view 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
Data Identifiers
Mindat Occurrence Record ID:472157
Long-form Identifier:1:3:472157:4
GUID (UUID V4):0
Nearest other occurrences of Opal
10.9km (6.8 miles) ⓘMother Lode (American Almaden; Consolidated Quicksilver; Canyon Creek), Howard Mining District (Ochoco Mining District; Bolivar Mining District), Crook County, Oregon, USA
23.4km (14.5 miles) ⓘPost, Crook County, Oregon, USA
26.7km (16.6 miles) ⓘBarnes Butte (Prineville Quicksilver), Howard Mining District (Ochoco Mining District; Bolivar Mining District), Crook County, Oregon, USA
51.4km (31.9 miles) ⓘPolka Dot Agate mine, Jefferson County, Oregon, USA
53.5km (33.2 miles) ⓘThunderegg Deposit, Pony Butte, Jefferson County, Oregon, USA
56.2km (34.9 miles) ⓘRichardson Ranch, Madras, Jefferson County, Oregon, USA
65.5km (40.7 miles) ⓘRound Butte Cinder Pit, Jefferson County, Oregon, USA
93.1km (57.9 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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