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ATHENA

MINERALOGY

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Mineral: GONNARDITE
Formula: (Na,Ca)6-8[(Al,Si)20O40].12H2O
Crystal System: Orthorhombic
Group: Zeolite group. Natrolite subgroup
IMA Number: 1997 s.p.
References: MM 52 (1988), 207; HB2/1 (1995); EJM 10 (1998), 1037; AM 84 (1999), 1445
Type Locality: Chaux-de-Bergonne, Gignat, Puy-de-Dôme, France

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