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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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Ganomalite from
Crestmore quarries, Crestmore, Jurupa Valley, Riverside County, California, USA


Locality type:Quarry
Classification
Species:Ganomalite
Formula:Pb9Ca5Mn(Si2O7)4(SiO4)O
Comments:Occurs as druses of minute crystals.

According to upcoming article in American Mineralogist by Kampf et al, most likely all ganomalite found at Crestmore is wayneburnhamite - as both purple-grey crystalline coatings and sea-green colored crystals.
Colour:Dark gray to black
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Ganomalite data
Locality Data:Click here to view Crestmore quarries, Crestmore, Jurupa Valley, Riverside County, California, USA
Data Identifiers
Mindat Occurrence Record ID:26363
Long-form Identifier:1:3:26363:6
GUID (UUID V4):0
Nearest other occurrences of Ganomalite
0.2km (0.1 miles) ⓘCommercial Quarry, Sky Blue Hill, Crestmore quarries, Crestmore, Jurupa Valley, Riverside County, California, USA
References
[micromounts@yahoogroups.com]
Jenni, Clarence M. (1957), Crestmore and its minerals: Gems & Minerals, No. 237: 38-40 (June 1957): 36
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
 
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