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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Dumortierite from
Unnamed Dumortierite occurrence [2], Picacho Peak, Picacho Mining District, Chocolate Mountains, Imperial County, California, USA


Locality type:Occurrence
Classification
Species:Dumortierite
Formula:Al(Al2O)(Al2O)2(SiO4)3(BO3)
Comments:Occurs in boulders of dark blue material.
Colour:Dark blue
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Kyanite1
Epidote1
Data
Mineral Data:Click here to view Dumortierite data
Locality Data:Click here to view Unnamed Dumortierite occurrence [2], Picacho Peak, Picacho Mining District, Chocolate Mountains, Imperial County, California, USA
Data Identifiers
Mindat Occurrence Record ID:325367
Long-form Identifier:1:3:325367:0
GUID (UUID V4):0
Nearest other occurrences of Dumortierite
2.0km (1.3 miles) ⓘUnnamed Dumortierite occurrences [1], Ogilby, Imperial County, California, USA
5.5km (3.4 miles) ⓘIndian Pass placer, Indian Pass, Chocolate Mountains Mining District, Chocolate Mountains, Imperial County, California, USA
18.9km (11.7 miles) ⓘClip Mine, Clip, Hidden Valley, Silver Mining District, La Paz County, Arizona, USA
19.8km (12.3 miles) ⓘClip, Hidden Valley, Silver Mining District, La Paz County, Arizona, USA
20.1km (12.5 miles) ⓘClip Wash, Clip, Hidden Valley, Silver Mining District, La Paz County, Arizona, USA
81.3km (50.5 miles) ⓘQuartzsite deposit, Quartzsite, La Paz County, Arizona, USA
82.7km (51.4 miles) ⓘDome Rock Mountains, La Paz County, Arizona, USA
References
Ransom, J.E. (1955) Arizona gem trails and the Colorado Desert. Mineralogist Publishing Co., Portland, Oregon: 19-20
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
U.S. Bureau of Mines Open File Report MLA 18-86 (1986): No. 15, Table 1, p. 11.
 
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