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Offretite

Type Locality
Mont Semiol (Mont Semiouse; Mont Simiouse), Châtelneuf, Saint-Georges-en-Couzan, Loire, Rhône-Alpes, France
Mineral Data
KCaMgAl5Si13O36·16H2O or near
Strunz: 
9.GD.25
Physical Properties
Hardness: 
4.0 - 4.5
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