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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Amblygonite from
Midnight Owl Mine, Independence Gulch, White Picacho Mining District, Yavapai County, Arizona, USA


Locality type:Open-Cast Mine
Classification
Species:Amblygonite
Formula:LiAl(PO4)F
Comments:This material is believed to be montebrasite. Material in the core forms rough, nearly equi-dimentional masses 12 inches (30 cm) or less in diameter with rough crystal faces. Other masses are much larger. One unusually large pod, 20 feet in maximum exposed dimension appears to be an aggregate of crystals 3 inches to more than 4 feet in diameter. Chemical analyses by London and Burt (1982) supersede former field identifications of earlier publications.
Habit:Very large
Colour:White
Quality for species:Good crystals or rich for species - important (!)
Abundance at site:Very common
Confirmation
Validity:Erroneously Reported
Data
Mineral Data:Click here to view Amblygonite data
Locality Data:Click here to view Midnight Owl Mine, Independence Gulch, White Picacho Mining District, Yavapai County, Arizona, USA
Data Identifiers
Mindat Occurrence Record ID:157828
Long-form Identifier:1:3:157828:7
GUID (UUID V4):0
Nearest other occurrences of Amblygonite
7.4km (4.6 miles) ⓘNorth Morning Star Mine, Morning Star Mine (Morning Star prospects; Morning Star pegmatites), San Domingo Wash, White Picacho Mining District, Maricopa County, Arizona, USA
References
London, D., Burt, D.M. (1982) Alteration of spodumene, montebrasite and lithiophilite in pegmatites of the White Picacho district, Arizona. American Mineralogist: 67: 97-113.
 
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