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Nagashimalite

Type Locality
Mogurazawa mine, Kiryuu City, Gunma Prefecture, Kanto Region, Honshu Island, Japan
Mineral Data
Ba4(V,Ti)4B2Si8O27(O,OH)2Cl
Strunz: 
9.CE.20
Physical Properties
Crystal System: 
Orthorhombic
Streak: 
green
Hardness: 
6.0