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
Opaline, Owyhee County, Idaho, 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 Opaline, Owyhee County, Idaho, USA
Data Identifiers
Mindat Occurrence Record ID:148486
Long-form Identifier:1:3:148486:1
GUID (UUID V4):0
Nearest other occurrences of Opal
4.8km (3.0 miles) ⓘPumice Occurrence (MRDS - 10070280), Marsing Area, Owyhee County, Idaho, USA
15.9km (9.9 miles) ⓘDiatomite Occurrence (MRDS - 10106007), Reynolds Area, Owyhee County, Idaho, USA
39.3km (24.4 miles) ⓘSheaville Zeolite Occurrence, Malheur County, Oregon, USA
41.8km (26.0 miles) ⓘOwyhee Dam, Lake Owyhee State Park, Malheur County, Oregon, USA
46.1km (28.6 miles) ⓘSnively Hot Spring, Malheur County, Oregon, USA
52.0km (32.3 miles) ⓘDiatomite Mine (Bates Creek), French Mining District, Owyhee County, Idaho, USA
53.6km (33.3 miles) ⓘUnnamed Diatomite occurrence [1], Boise Mining District, Ada County, Idaho, USA
54.1km (33.6 miles) ⓘDiatomite Occurrence (MRDS - 10089089), Boise Mining District, Ada County, Idaho, USA
55.4km (34.4 miles) ⓘUnnamed Diatomite occurrence [2], Boise Mining District, Ada County, Idaho, USA
59.6km (37.0 miles) ⓘBrandon Occurrence (Quartz Mtn.; Glassy Butte), Malheur County, Oregon, USA
References
Dake, H. C. (1956) Northwest Gem Trails - A Field Guide for the Gem Hunter, Mineral Collector and Tourist (2nd ed.) Gembooks.
 
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