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Gonnardite

Type Locality
La Chaux de Bergonne, Gignat, Saint-Germain-Lembron, Puy-de-Dôme, Auvergne, France
Mineral Data
(Na,Ca)2(Si,Al)5O10·3H2O
Strunz: 
9.GA.05
Physical Properties
Hardness: 
4.0 - 5.0
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