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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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Bertrandite from
Kristiansen Quarry (Bånkall Quarry), Bånkall, Grorud, Oslo, Norway


Locality type:Quarry
Classification
Species:Bertrandite
Formula:Be4(Si2O7)(OH)2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Bertrandite data
Locality Data:Click here to view Kristiansen Quarry (Bånkall Quarry), Bånkall, Grorud, Oslo, Norway
Data Identifiers
Mindat Occurrence Record ID:84295
Long-form Identifier:1:3:84295:6
GUID (UUID V4):0
Nearest other occurrences of Bertrandite
2.6km (1.6 miles) ⓘBjønndalen Quarry, Nittedal, Akershus, Norway
25.8km (16.0 miles) ⓘHarestua, Lunner, Akershus, Norway
30.1km (18.7 miles) ⓘSpro pegmatite, Nesodden, Akershus, Norway
34.2km (21.2 miles) ⓘMidtmoen, Øståsen, Lunner, Akershus, Norway
39.8km (24.8 miles) ⓘSætre, Hurum, Asker, Akershus, Norway
40.0km (24.9 miles) ⓘFollestad waste facility, Follestad industrial site, Røyken, Asker, Akershus, Norway
42.8km (26.6 miles) ⓘØksne Quarry, Lier, Buskerud, Norway
42.8km (26.6 miles) ⓘGrimsrudbukta, Røyken, Asker, Akershus, Norway
43.3km (26.9 miles) ⓘGrimsrud Molybdenum prospect, Hurum, Asker, Akershus, Norway
45.4km (28.2 miles) ⓘSelvigstranda Prospect, Hurum, Asker, Akershus, Norway
References
Oftedal, Ivar; Sæbø, Per Christian (1963) Contributions to the mineralogy of Norway. No. 18. Classification of some Norwegian members of the Helvine Group. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 43 (3). 405-409
Oftedal, Ivar; Ahlberg, Per; Sæbø, Per Christian (1965) Contributions to the mineralogy of Norway. No. 30. Minerals from nordmarkite druses. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 45 (2). p.171-175.
Kvamsdal, Lars O. (1998) Mineralene fra Nordmarkitt og Grefsensyenitt i Oslofeltet [The minerals from the nordmarkite and grefsensyenites in the Oslo region area]. Privat publication, AS Merkur-Trykk, Oslo. p.1-72.
 
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