Vote for your favorite mineral in #MinCup26! - Quartz vs. Asagiite
It's a classic vs a newbie as the most common named mineral in the crust Quartz is up against an exceedingly-rare sea foam-green mineral discovered just a few years ago Asagiite.
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Psilomelane from
Grass Valley Mining District, Nevada County, California, USA


Locality type:Mining District
Classification
Species:'Psilomelane' (not an IMA approved species)
Comments:Widespread but not abundant in the district.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Psilomelane data
Locality Data:Click here to view Grass Valley Mining District, Nevada County, California, USA
Data Identifiers
Mindat Occurrence Record ID:671814
Long-form Identifier:1:3:671814:5
GUID (UUID V4):0
Nearest other occurrences of Psilomelane
11.3km (7.0 miles) ⓘRyan prospect (Ryan Bartholf & Veach; You Bet; Midway claim; Negro Heaven claim; Bluebird claim), You Bet (Chalk Bluffs), You Bet Mining District, Nevada County, California, USA
14.8km (9.2 miles) ⓘPaine Brothers Mine (Paine Bros; Paine Brs.; Paine), Lake City, North Bloomfield Mining District, Nevada County, California, USA
15.7km (9.8 miles) ⓘArnold prospect, Dew Drop, Nevada County, California, USA
17.4km (10.8 miles) ⓘSanto prospect, Dew Drop, Nevada County, California, USA
18.3km (11.3 miles) ⓘManga-Chrome Mine (Manga Chrome; Magna-Chrome Mine; Duggan Mine; Steams and Owens [?]), Limekiln, Spenceville Mining District, Nevada County, California, USA
19.7km (12.2 miles) ⓘLloyd prospect, Weimar, Colfax Mining District (Illinois Mining District), Placer County, California, USA
23.5km (14.6 miles) ⓘGold Hill Mine (Crown Point Mine), Yankee Jims, Forest Hill Mining District, Placer County, California, USA
23.6km (14.7 miles) ⓘRandel claim No. 1 (American; Tilsley and Coplen claim; Tilsey & Coplen group [of WWI]), Yankee Jims, Forest Hill Mining District, Placer County, California, USA
24.6km (15.3 miles) ⓘPettigrew-Stafford Mine (Pettigrew - Stafford lease; Gray lease), Yankee Jims, Forest Hill Mining District, Placer County, California, USA
37.9km (23.6 miles) ⓘDavid prospect, Georgetown, Georgetown District, East Segment Mother Lode, El Dorado County, California, USA
References
Johnston, William Drumm (1940), The gold-quartz veins of Grass Valley, California: USGS PP 194, 101 pp.: 44
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 298.
 
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