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ATHENA

MINERALOGY

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Mineral: TVEDALITE
Formula: (Ca,Mn2+)4Be3Si6O17(OH)4.3H2O
Crystal System: Orthorhombic
Group: Zeolite group related
IMA Number: 1990-027
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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