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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Montmorillonite from
Chief Extension prospects, Pala Chief Mine, Chief Mountain, Pala, Pala Mining District, San Diego County, California, USA


Locality type:Prospect
Classification
Species:Montmorillonite
Formula:(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Montmorillonite data
Locality Data:Click here to view Chief Extension prospects, Pala Chief Mine, Chief Mountain, Pala, Pala Mining District, San Diego County, California, USA
Data Identifiers
Mindat Occurrence Record ID:791964
Long-form Identifier:1:3:791964:0
GUID (UUID V4):0
Nearest other occurrences of Montmorillonite
0.2km (0.1 miles) ⓘElizabeth R. Mine (Hazel W. claim), Chief Mountain, Pala, Pala Mining District, San Diego County, California, USA
0.3km (0.2 miles) ⓘOceanview Mine (Oceanview adits; new Oceanview workings), Elizabeth R. Mine (Hazel W. claim), Chief Mountain, Pala, Pala Mining District, San Diego County, California, USA
1.0km (0.7 miles) ⓘLittle Joe adit, Stewart Mine, Tourmaline Queen Mountain (Pala Mtn; Queen Mtn), Pala, Pala Mining District, San Diego County, California, USA
1.1km (0.7 miles) ⓘLittle Joe No. 2 adit, Stewart Mine, Tourmaline Queen Mountain (Pala Mtn; Queen Mtn), Pala, Pala Mining District, San Diego County, California, USA
1.2km (0.8 miles) ⓘStewart Mine, Tourmaline Queen Mountain (Pala Mtn; Queen Mtn), Pala, Pala Mining District, San Diego County, California, USA
1.6km (1.0 miles) ⓘTourmaline Queen Mine, Tourmaline Queen Mountain (Pala Mtn; Queen Mtn), Pala, Pala Mining District, San Diego County, California, USA
1.8km (1.1 miles) ⓘWhite Queen Mine, Hiriart Mountain, Pala, Pala Mining District, San Diego County, California, USA
2.0km (1.3 miles) ⓘTourmaline King Mine, Tourmaline Queen Mountain (Pala Mtn; Queen Mtn), Pala, Pala Mining District, San Diego County, California, USA
30.7km (19.1 miles) ⓘHimalaya Mine, Gem Hill, Mesa Grande Mining District, San Diego County, California, USA
32.4km (20.2 miles) ⓘAnita Mine (Magee Mine; Magee & Dougherty Mine; Sage Mine), Red Mountain, Cahuilla Mining District, Riverside County, California, USA
References
Hapeman, Jeffrey R. (2011)
 
and/or  
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