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Mullite

Type Locality
Seabank Villa, Isle of Mull, Strathclyde (Argyllshire), Scotland, UK
Mineral Data
Al4+2xSi2-2xO10-x
Strunz: 
9.AF.20
Physical Properties
Crystal System: 
Orthorhombic
Hardness: 
6.0 - 7.0