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Eudidymite

Type Locality
Eudidymite locality, Lille Arøya (Midtre Arøy; Øvre Arøy; Övre-Arö), Langesundsfjorden, Larvik, Vestfold, Norway
Mineral Data
Na2Be2Si6O15·H2O
Strunz: 
9.DG.60
Physical Properties
Hardness: 
6.0