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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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Thomsonite-Ca from
Franklin Mine, Franklin, Sussex County, New Jersey, USA


03165070017363102632537.jpg
Thomsonite-Ca, etc.

Franklin Mine, Franklin, Sussex County, New Jersey, USA
03165070017363102632537.jpg
Thomsonite-Ca, etc.

Franklin Mine, Franklin, Sussex County, New Jersey, USA
05679220017360849452915.jpg
Thomsonite-Ca, etc.

Franklin Mine, Franklin, Sussex County, New Jersey, USA
Locality type:Mine
Classification
Species:Thomsonite-Ca
Formula:NaCa2[Al5Si5O20] · 6H2O
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Aragonite1
Data
Mineral Data:Click here to view Thomsonite-Ca data
Locality Data:Click here to view Franklin Mine, Franklin, Sussex County, New Jersey, USA
Data Identifiers
Mindat Occurrence Record ID:54548
Long-form Identifier:1:3:54548:8
GUID (UUID V4):0
Localities for Thomsonite-Ca in this Region
Mill site dump, Franklin Mine, Franklin, Sussex County, New Jersey, USA
Nearest other occurrences of Thomsonite-Ca
0.8km (0.5 miles) ⓘMill site dump, Franklin Mine, Franklin, Sussex County, New Jersey, USA
4.0km (2.5 miles) ⓘPassaic pit (Marshall Mine; Passaic Mine), Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA
39.6km (24.6 miles) ⓘProspect Park Quarry, Prospect Park, Passaic County, New Jersey, USA
40.9km (25.4 miles) ⓘLower New Street Quarry, Paterson, Passaic County, New Jersey, USA
41.1km (25.5 miles) ⓘUpper New Street Quarry, Paterson, Passaic County, New Jersey, USA
41.8km (26.0 miles) ⓘFrancisco Brothers Quarry, Great Notch, Little Falls Township, Passaic County, New Jersey, USA
48.8km (30.3 miles) ⓘMillington Quarry, Bernards Township, Somerset County, New Jersey, USA
59.0km (36.7 miles) ⓘPeekskill, Westchester County, New York, USA
60.7km (37.7 miles) ⓘDelaware - Lackawanna & Western Railroad tunnels, Bergen Hill, Jersey City, Hudson County, New Jersey, USA
85.6km (53.2 miles) ⓘTilly Foster Iron Mine, Town of Southeast, Putnam County, New York, USA
References
Palache, Charles (1935) The minerals of Franklin and Sterling Hill, Sussex County, New Jersey. Professional Paper 180. US Geological Survey 135 pp. doi:10.3133/pp180 p.115
Cook, David K. (1973) Recent Work on the Minerals of Franklin and Sterling Hill, New Jersey. The Mineralogical Record, 4 (2) 62-66
Dunn(1995):Pt4:515.
 
and/or  
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