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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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Weibyeite from
Eudidymite locality, Lille Arøya, Larvik Commune, Vestfold, Norway


Locality type:Pegmatite
Classification
Species:'Weibyeite' (not an IMA approved species)
Comments:A sample labelled Weibyeite and collected by W.C.Brøgger in 1902 was showed by Sverdrup et al. (1959) to be bastnäsite-(Ce). Sæbø (1963) rexamined Brøggers "Weibyeite" and found it to be a mixture of Ancylite-(Ce) and bastnäsite-(Ce) pseudomorphs after ancylite-(Ce)
Confirmation
Validity:Erroneously Reported
Data
Mineral Data:Click here to view Weibyeite data
Locality Data:Click here to view Eudidymite locality, Lille Arøya, Larvik Commune, Vestfold, Norway
Data Identifiers
Mindat Occurrence Record ID:732018
Long-form Identifier:1:3:732018:7
GUID (UUID V4):0
References
Brøgger, Waldemar Christofer (1890) Die Mineralien der Syenitpegmatitgänge der südnorwegischen Augit- und Nephelinsyenite. Zeitschrift für Krystallographie und Mineralogie, 16 (1). 1-893pp.650-658
Sverdrup, Thor L.; Bryn, Knut Ørn; Sæbø, Per Christian (1959) Contributions to the mineralogy of Norway. No. 2. Bastnäsite, a new mineral for Norway. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 39 (2-3). 237-247
Sæbø, Per Christian (1963) Contributions to the mineralogy of Norway. No. 20. The identity of Weibyeite. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 43 (4). 441-443
 
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