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Dumortierite
Type Locality
Ducarre's Quarry, Beaunant, Chaponost, Rhône, Rhône-Alpes, France
Mineral Data
(Al,Fe
3+
)
7
(SiO
4
)
3
(BO
3
)O
3
Strunz:
9.AJ.10
Physical Properties
Crystal System:
Orthorhombic
Hardness:
7.0 - 8.0
Tenacity:
brittle
