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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
Spro pegmatite, Nesodden, Akershus, Norway


Locality type:Pegmatite
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 Spro pegmatite, Nesodden, Akershus, Norway
Data Identifiers
Mindat Occurrence Record ID:768389
Long-form Identifier:1:3:768389:3
GUID (UUID V4):0
Nearest other occurrences of Bertrandite
9.9km (6.2 miles) ⓘFollestad waste facility, Follestad industrial site, Røyken, Asker, Akershus, Norway
10.1km (6.3 miles) ⓘSætre, Hurum, Asker, Akershus, Norway
12.8km (7.9 miles) ⓘGrimsrudbukta, Røyken, Asker, Akershus, Norway
13.2km (8.2 miles) ⓘGrimsrud Molybdenum prospect, Hurum, Asker, Akershus, Norway
15.3km (9.5 miles) ⓘSelvigstranda Prospect, Hurum, Asker, Akershus, Norway
16.1km (10.0 miles) ⓘGrønlia, Svelvik, Drammen, Buskerud, Norway
17.9km (11.1 miles) ⓘJuve Quarry, Svelvik, Drammen, Buskerud, Norway
22.4km (13.9 miles) ⓘØksne Quarry, Lier, Buskerud, Norway
25.8km (16.1 miles) ⓘBlindevann, Sande, Holmestrand, Vestfold, Norway
28.3km (17.6 miles) ⓘSkafjellåsen, Sande, Holmestrand, Vestfold, Norway
References
Raade, Gunnar (1981) To nye forekomster av bertranditt [Two new localities for bertrandite]. Mineralogisk-Geologisk Museum - Universitetet i Oslo- Interne notater, Geologisk Museums venner. 86-87
 
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