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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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Zirconolite-3O from
E18 roadcuts, Slevolden, Porsgrunn, Telemark, Norway


Locality type:Road Cutting
Classification
Species:'Zirconolite-3O' (not an IMA approved species)
Formula:(Ca,REE)2Zr2(Ti,Nb)3FeO14
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Zirconolite-3O data
Locality Data:Click here to view E18 roadcuts, Slevolden, Porsgrunn, Telemark, Norway
Data Identifiers
Mindat Occurrence Record ID:680862
Long-form Identifier:1:3:680862:4
GUID (UUID V4):0
Nearest other occurrences of Zirconolite-3O
1.0km (0.6 miles) ⓘRønningen E 18 roadcuts, Porsgrunn, Telemark, Norway
8.1km (5.0 miles) ⓘIglestjern Quarry, Kjose, Larvik Commune, Vestfold, Norway
13.2km (8.2 miles) ⓘMidtfjellet Quarry, Malerød, Larvik Commune, Vestfold, Norway
13.4km (8.3 miles) ⓘVardåsen Quarry, Malerød, Larvik Commune, Vestfold, Norway
19.1km (11.9 miles) ⓘHedrum Quarry, Lågendalen, Hedrum, Larvik Commune, Vestfold, Norway
19.6km (12.2 miles) ⓘByskogen, Larvik town, Larvik Commune, Vestfold, Norway
20.2km (12.5 miles) ⓘTrondsrødfjellet roadcut Rv 301 (Agnes), Stavern (Fredriksvärn), Larvik Commune, Vestfold, Norway
21.7km (13.5 miles) ⓘResidental Lot along RV 301, Stavern (Fredriksvärn), Larvik Commune, Vestfold, Norway
21.9km (13.6 miles) ⓘRødbøl roadcut, Hedrum, Larvik Commune, Vestfold, Norway
21.9km (13.6 miles) ⓘRingdalskogen, Hedrum, Larvik Commune, Vestfold, Norway
References
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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