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Trembathite

Type Locality
Clover Hill deposit (Denison-Potacan mine; Potacan mine; Cassidy Potash mine), Salt Springs evaporite deposit, Hammond Parish, Kings Co., New Brunswick, Canada
Mineral Data
(Mg,Fe)3(B7O13)Cl
Strunz: 
6.GA.10
Physical Properties
Crystal System: 
Trigonal
Hardness: 
6.0 - 8.0