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Danburite

Type Locality
Danbury, Fairfield Co., Connecticut, USA
Mineral Data
CaB2Si2O8
Strunz: 
9.FA.65
Physical Properties
Crystal System: 
Orthorhombic
Streak: 
White
Hardness: 
7.0 - 7.5
Tenacity: 
brittle
Synonyms
Synonyms: 
Danburita