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Cordierite

Type Locality
Großer Arber, Bayerisch Eisenstein, Lower Bavaria, Bavaria, Germany
Mineral Data
(Mg,Fe)2Al3(AlSi5O18)
Strunz: 
9.CJ.10
Physical Properties
Crystal System: 
Orthorhombic
Hardness: 
7.0 - 7.5
Tenacity: 
brittle
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