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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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Pyrochlore Group from
Blokksten Quarry, Tjølling, Larvik Commune, Vestfold, Norway


Locality type:Quarry
Classification
Species:'Pyrochlore Group' (not an IMA approved species)
Formula:A2Nb2(O,OH)6Z
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Pyrochlore Group data
Locality Data:Click here to view Blokksten Quarry, Tjølling, Larvik Commune, Vestfold, Norway
Data Identifiers
Mindat Occurrence Record ID:756290
Long-form Identifier:1:3:756290:7
GUID (UUID V4):0
Nearest other occurrences of Pyrochlore Group
0.5km (0.3 miles) ⓘHasle Quarry, Klåstad, Tjølling, Larvik Commune, Vestfold, Norway
0.6km (0.4 miles) ⓘSkallist Quarry, Klåstad, Tjølling, Larvik Commune, Vestfold, Norway
1.0km (0.6 miles) ⓘKlåstad Quarry, Klåstad, Tjølling, Larvik Commune, Vestfold, Norway
3.9km (2.4 miles) ⓘStålaker Quarry, Stålaker, Tjølling, Larvik Commune, Vestfold, Norway
4.1km (2.6 miles) ⓘHåkestad Quarry, Håkestad, Tjølling, Larvik Commune, Vestfold, Norway
4.7km (2.9 miles) ⓘAsnes, Vesterøya, Sandefjord, Vestfold, Norway
4.8km (3.0 miles) ⓘVøra, Vesterøya, Sandefjord, Vestfold, Norway
4.9km (3.0 miles) ⓘHusefjell, Vesterøya, Sandefjord, Vestfold, Norway
5.1km (3.2 miles) ⓘSandvika, Tjølling, Larvik Commune, Vestfold, Norway
5.1km (3.2 miles) ⓘUla pegmatite, Ula, Tjølling, Larvik Commune, Vestfold, Norway
References
Knut Edvard Larsen collection # MM-1743
 
and/or  
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