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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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Dickinsonite-(KMnNa) from
Tamminen Quarry, Greenwood, Oxford County, Maine, USA


Locality type:Quarry
Classification
Species:Dickinsonite-(KMnNa)
Formula:(KNa)(Mn2+◻)Ca(Na2Na)Mn132+Al(PO4)11(PO4)(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Dickinsonite-(KMnNa) data
Locality Data:Click here to view Tamminen Quarry, Greenwood, Oxford County, Maine, USA
Data Identifiers
Mindat Occurrence Record ID:28429
Long-form Identifier:1:3:28429:5
GUID (UUID V4):0
Nearest other occurrences of Dickinsonite-(KMnNa)
6.2km (3.9 miles) ⓘEmmons Quarry, Uncle Tom Mountain, Greenwood, Oxford County, Maine, USA
13.9km (8.6 miles) ⓘRyerson Hill Quarries, Paris, Oxford County, Maine, USA
21.7km (13.5 miles) ⓘMount Rubellite Quarries, Mount Rubellite, Hebron, Oxford County, Maine, USA
29.6km (18.4 miles) ⓘDunton Gem Quarry, Newry, Oxford County, Maine, USA
33.6km (20.9 miles) ⓘBlack Mountain Quarry, Rumford, Oxford County, Maine, USA
34.3km (21.3 miles) ⓘGroves Quarry (Hole in the Ground Quarry), West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
34.5km (21.4 miles) ⓘPulsifer Quarry & Dionne extension, West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
34.6km (21.5 miles) ⓘKeith Quarry (Towne Quarry), West Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
35.3km (21.9 miles) ⓘMaine Feldspar Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
35.3km (21.9 miles) ⓘGreenlaw Quarry, East Mount Apatite Mining District, Auburn, Androscoggin County, Maine, USA
References
Thompson, Woodrow B., Joyner, Ronald L., Woodman, Raymond G., King, Vandall T. (1998) Bulletin (41), A Collector's Guide to Maine Mineral Localities (3rd ed.) Maine Geological Survey
 
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