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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Chalcedony from
Unnamed Agate-Quartz occurrence [2], Robbers Mountain, San Bernardino County, California, USA


Locality type:Occurrence
Classification
Species:Quartz var: Chalcedony
Formula:SiO2
Comments:Occurs in geodes.
Colour:Blue
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Chalcedony data
Locality Data:Click here to view Unnamed Agate-Quartz occurrence [2], Robbers Mountain, San Bernardino County, California, USA
Data Identifiers
Mindat Occurrence Record ID:146185
Long-form Identifier:1:3:146185:5
GUID (UUID V4):0
Nearest other occurrences of Chalcedony
12.5km (7.8 miles) ⓘUnnamed Agate-Quartz occurrence [1], Eagle Crags, San Bernardino County, California, USA
15.9km (9.9 miles) ⓘUnnamed Hg occurrence [3], Eagle Crags, San Bernardino County, California, USA
20.0km (12.4 miles) ⓘMyrick Spring occurrence, Myrick Spring, Granite Mts [3], San Bernardino County, California, USA
29.8km (18.5 miles) ⓘUnnamed Gemstone occurrence [14], Brown Mountain, Quail Mountains, San Bernardino County, California, USA
33.3km (20.7 miles) ⓘWingate Pass (Windy Gap), San Bernardino County, California, USA
34.1km (21.2 miles) ⓘOpal Mountains Agate Field prospect (Black Mountain; Black Mtn), Opal Mountain, San Bernardino County, California, USA
45.4km (28.2 miles) ⓘUnnamed Chalcedony prospect [1] (Gem Mineral prospect; Unnamed prospect), Quail Spring, Quail Mountains, San Bernardino County, California, USA
46.6km (29.0 miles) ⓘMud Hills (Strontium Hills), Barstow Mining District, San Bernardino County, California, USA
49.6km (30.9 miles) ⓘChalcedony Pseudomorphs occurrence, Mud Hills (Strontium Hills), Barstow Mining District, San Bernardino County, California, USA
53.1km (33.0 miles) ⓘRainbow Ridge, Goler Heights, El Paso Mountains District, Kern County, California, USA
References
Perry, L. E. 1961 Varied agate types and locations in California: Lapidary Journal, v. 15, no. 3, p. 308-314.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 317.
 
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