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
Unnamed Opal occurrence [1], Black Mountain [2], San Bernardino County, California, USA


Locality type:Occurrence
Classification
Species:Opal
Formula:SiO2 · nH2O
Comments:Semi-precious material.
Colour:Pink, amber
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Unnamed Opal occurrence [1], Black Mountain [2], San Bernardino County, California, USA
Data Identifiers
Mindat Occurrence Record ID:649484
Long-form Identifier:1:3:649484:1
GUID (UUID V4):0
Nearest other occurrences of Opal
2.8km (1.7 miles) ⓘOpal Mountain, San Bernardino County, California, USA
3.1km (1.9 miles) ⓘOpal Mountains Agate Field prospect (Black Mountain; Black Mtn), Opal Mountain, San Bernardino County, California, USA
3.4km (2.1 miles) ⓘUnnamed Opal-Perlite prospects [1], Opal Mountain, San Bernardino County, California, USA
31.4km (19.5 miles) ⓘUnnamed Agate-Quartz occurrence [2], Robbers Mountain, San Bernardino County, California, USA
39.2km (24.4 miles) ⓘCalico District (Daggett District; Calico-Daggett area), Calico Mts (Calico Hills), San Bernardino County, California, USA
39.5km (24.5 miles) ⓘSaddleback Mountain, East Kramer Borate area (East Kramer Colemanite area), East Kramer Mining District, San Bernardino County, California, USA
45.0km (28.0 miles) ⓘMabel S claim, Randsburg, Kern County, California, USA
45.6km (28.3 miles) ⓘKramer Borate deposit, Boron, Kern County, California, USA
46.9km (29.1 miles) ⓘVanuray prospect, West Baker, Kramer Borate deposit, Boron, Kern County, California, USA
62.6km (38.9 miles) ⓘBlack Raven prospect (Lankin; Newberry), Newberry Springs, Newberry Mountains, San Bernardino County, California, USA
References
Kunz, George Frederick (1903), Precious stones: Mineral Resources U.S., 1902: 76 (?)
Baker, Charles L. (1911), Notes on the later Cenozoic history of the Mohave Desert region in southeastern California: California University Department of Geological Science Bulletin: 6: 347 (?)
Sterrett, Douglas Bovard (1912), Gems and precious stones: Mineral Resources U.S., 1911, part 2: 1050
Sinkankas, John (1959) Gemstones of North America Vol. 1. Van Nostrand Reinhold Co., New York.p.124
 
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