Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
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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Cronstedtite from
Rønningen E 18 roadcuts, Porsgrunn, Telemark, Norway


Locality type:Road Cutting
Classification
Species:Cronstedtite
Formula:Fe22+Fe3+((Si,Fe3+)2O5)(OH)4
Comments:Reinvestigation showed it to be chamosite (Larsen (2010)
Confirmation
Validity:Erroneously Reported
Data
Mineral Data:Click here to view Cronstedtite data
Locality Data:Click here to view Rønningen E 18 roadcuts, Porsgrunn, Telemark, Norway
Data Identifiers
Mindat Occurrence Record ID:632567
Long-form Identifier:1:3:632567:1
GUID (UUID V4):0
References
Andersen, Frode; Berge, Svein Arne; Burvald, Ingulv (1996) Die Mineralien des Langesundsfjords und des umgebenden Larvikit-Gebietes, Oslo-Region, Norwegen. Mineralien Welt, 7 (4). 21-100
Larsen, Alf Olav; Andersen, Frode; Dahlgren, Sven; Larsen, Knut Edvard; Burvald, Ingulv - Ed. (2010) The Langesundsfjord - History, geology, pegmatites, minerals. Bode Verlag Gmbh. 240 pp.
 
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