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Tvedalite

Type Locality
Vevja Quarry, Tvedalen, Larvik, Vestfold, Norway
Mineral Data
(Ca,Mn)4Be3Si6O17(OH)4·3H2O
Strunz: 
9.DF.20
Physical Properties
Crystal System: 
Orthorhombic
Streak: 
white
Hardness: 
4.5