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Eucryptite

Type Locality
Fillow Quarry (Branchville Quarry; Branchville Mica Mine; Smith Mine), Branchville, Redding (Reading), Fairfield Co., Connecticut, USA
Mineral Data
LiAlSiO4
Strunz: 
9.AA.05
Physical Properties
Crystal System: 
Hexagonal
Streak: 
White
Hardness: 
6.5
Tenacity: 
brittle