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Dumortierite

Type Locality
Ducarre's Quarry, Beaunant, Chaponost, Rhône, Rhône-Alpes, France
Mineral Data
(Al,Fe3+)7(SiO4)3(BO3)O3
Strunz: 
9.AJ.10
Physical Properties
Crystal System: 
Orthorhombic
Hardness: 
7.0 - 8.0
Tenacity: 
brittle
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