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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Nontronite from
Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA


09286210017272010024044.jpg
Nontronite, etc.

Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
08871700017272010322108.jpg
Nontronite

Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
03346800017272010352628.jpg
Nontronite

Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
02450590017272010391431.jpg
Nontronite, etc.

Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
09286210017272010024044.jpg
Nontronite, etc.

Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
02776110017363860151337.jpg
Nontronite

Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
05674040017363860154039.jpg
Nontronite

Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
01814570017363860162161.jpg
Nontronite, etc.

Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
09286210017272010024044.jpg
Nontronite, etc.

Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
08871700017272010322108.jpg
Nontronite

Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
03346800017272010352628.jpg
Nontronite

Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
02450590017272010391431.jpg
Nontronite, etc.

Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
Locality type:Mine
Classification
Species:Nontronite
Formula:Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
Comments:Occurs in the supergene zone in collapse breccias.
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Actinolite2
Epidote2
Manganese Oxides2
Quartz1
Data
Mineral Data:Click here to view Nontronite data
Locality Data:Click here to view Twin Buttes Mine, Twin Buttes, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
Photo GalleryView Gallery (4 photos)
Data Identifiers
Mindat Occurrence Record ID:8108
Long-form Identifier:1:3:8108:5
GUID (UUID V4):0
Nearest other occurrences of Nontronite
32.9km (20.5 miles) ⓘPauline Mine, Mount Fagan, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
65.4km (40.7 miles) ⓘKartchner Caverns, Cochise County, Arizona, USA
References
Anthony, John W.; Williams, Sidney A.; Bideaux, Richard A.; Grant, Raymond W. (1995) Mineralogy of Arizona (3rd ed.). University of Arizona Press.p.314
 
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