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Kyanite

Mineral Data
Al2(SiO4)O
Strunz: 
9.AF.15
Physical Properties
Crystal System: 
Triclinic Forms long bladed crystals.
Streak: 
Colorless
Hardness: 
5.5 - 7.0
Tenacity: 
brittle
Synonyms
Synonyms: 
Disthene, Cyanite, Disthen, Cianita and Cianite