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
Opal Mountains Agate Field prospect (Black Mountain; Black Mtn), Opal Mountain, San Bernardino County, California, USA


Locality type:Prospect
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 Opal Mountains Agate Field prospect (Black Mountain; Black Mtn), Opal Mountain, San Bernardino County, California, USA
Data Identifiers
Mindat Occurrence Record ID:146236
Long-form Identifier:1:3:146236:4
GUID (UUID V4):0
Nearest other occurrences of Opal
1.6km (1.0 miles) ⓘOpal Mountain, San Bernardino County, California, USA
3.1km (1.9 miles) ⓘUnnamed Opal occurrence [1], Black Mountain [2], San Bernardino County, California, USA
6.5km (4.1 miles) ⓘUnnamed Opal-Perlite prospects [1], Opal Mountain, San Bernardino County, California, USA
34.1km (21.2 miles) ⓘUnnamed Agate-Quartz occurrence [2], Robbers Mountain, San Bernardino County, California, USA
36.2km (22.5 miles) ⓘCalico District (Daggett District; Calico-Daggett area), Calico Mts (Calico Hills), San Bernardino County, California, USA
40.0km (24.9 miles) ⓘSaddleback Mountain, East Kramer Borate area (East Kramer Colemanite area), East Kramer Mining District, San Bernardino County, California, USA
46.1km (28.7 miles) ⓘKramer Borate deposit, Boron, Kern County, California, USA
47.3km (29.4 miles) ⓘVanuray prospect, West Baker, Kramer Borate deposit, Boron, Kern County, California, USA
47.6km (29.6 miles) ⓘMabel S claim, Randsburg, Kern County, California, USA
59.7km (37.1 miles) ⓘBlack Raven prospect (Lankin; Newberry), Newberry Springs, Newberry Mountains, San Bernardino County, California, USA
References
Beste, Bob (2005) Location Guide for Rockhounds in the United States (3rd ed.)
 
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