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Låvenite

Type Locality
Låven (Skådön; Lamö; Lamanskjaer), Langesundsfjorden, Larvik, Vestfold, Norway
Mineral Data
(Na,Ca)2(Mn2+,Fe2+)(Zr,Ti)(Si2O7)(O,OH,F)2
Strunz: 
9.BE.17
Physical Properties
Hardness: 
6.0
Synonyms
Synonyms: 
Lavenite