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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Montmorillonite from
Sierra Peña Blanca, Peña Blanca District, Aldama Municipality, Chihuahua, Mexico


Locality type:Mining District
Classification
Species:Montmorillonite
Formula:(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Montmorillonite data
Locality Data:Click here to view Sierra Peña Blanca, Peña Blanca District, Aldama Municipality, Chihuahua, Mexico
Data Identifiers
Mindat Occurrence Record ID:1707802
Long-form Identifier:1:3:1707802:7
GUID (UUID V4):0
Localities for Montmorillonite in this Region
Margaritas No. 1 Mine, Sierra Peña Blanca, Peña Blanca District, Aldama Municipality, Chihuahua, Mexico
Nopal No. 1 Mine, Sierra Peña Blanca, Peña Blanca District, Aldama Municipality, Chihuahua, Mexico
Puerto No. 3 mine, Sierra Peña Blanca, Peña Blanca District, Aldama Municipality, Chihuahua, Mexico
Nearest other occurrences of Montmorillonite
10.5km (6.5 miles) ⓘPuerto No. 3 mine, Sierra Peña Blanca, Peña Blanca District, Aldama Municipality, Chihuahua, Mexico
10.7km (6.7 miles) ⓘNopal No. 1 Mine, Sierra Peña Blanca, Peña Blanca District, Aldama Municipality, Chihuahua, Mexico
10.9km (6.8 miles) ⓘMargaritas No. 1 Mine, Sierra Peña Blanca, Peña Blanca District, Aldama Municipality, Chihuahua, Mexico
55.3km (34.4 miles) ⓘSan Antonio Mine, East Camp, Santa Eulalia Mining District, Aquiles Serdán Municipality, Chihuahua, Mexico
References
Hernández-Herrera, Cristina; Canché-Tello, Jesús G.; Rodríguez-Guerra, Yair; Faudoa-Gómez, Fabián G.; Eichert, Diane M.; Ignatyev, Konstantin; Cabral-Lares, Rocío M.; Pérez-Reyes, Victoria; Esparza-Ponce, Hilda E.; Montero-Cabrera, María-Elena (2025) Uranium Mineral Particles Produced by Weathering in Sierra Peña Blanca, Chihuahua, Mexico: A Synchrotron-Based Study. Minerals, 15 (4). 333 doi:10.3390/min15040333
 
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