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MINERALOGY

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Mineral:TVEDALITE
Formula:(Ca,Mn2+)4Be3Si6O17(OH)4 · 3H2O
Crystal System:Orthorhombic
Strunz Nr:8/G.07-25
Group:Zeolite group
References:AM 77 (1992), 438; HB2/2 (1995); NM 90-94 (1997); EJM 10 (1998), 1037
Type Locality:Vevya quarry, Tvedalen, Vestfold Co., Norway
Comments:A possible beryllosilicate zeolite (?)

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