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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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Alleghanyite from
Jail Hill Road locality (Jail Hill Quarry), Haddam, Middlesex County, Connecticut, USA


Classification
Species:Alleghanyite
Formula:Mn52+(SiO4)2(OH)2
Comments:Found by Dick Schooner. A segregation over a foot in diameter, it consisted mainly of reddish alleghanyite and pinkish kutnohorite, with accessories. Unfortunately, only a few specimens were saved.
Colour:reddish
Quality for species:Poor for species, only of interest for locality collectors. (#)
Abundance at site:Very Rare
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
Data
Mineral Data:Click here to view Alleghanyite data
Locality Data:Click here to view Jail Hill Road locality (Jail Hill Quarry), Haddam, Middlesex County, Connecticut, USA
Data Identifiers
Mindat Occurrence Record ID:130239
Long-form Identifier:1:3:130239:4
GUID (UUID V4):0
References
Schooner, Richard. (circa 1980s), Untitled manuscript on central Connecticut minerals.
 
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