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Boracite

Type Locality
Lüneburger Kalkberg, Lüneburg, Lower Saxony, Germany
Mineral Data
Mg3(B7O13)Cl
Strunz: 
6.GA.05
Physical Properties
Crystal System: 
Orthorhombic
Streak: 
White
Hardness: 
7.0 - 7.5
Photos