Nigerite

General Information: Chemical Formula:(Fe++,Zn)4Sn2(Al,Fe+++)15O30(OH)2 Environment:Pegmatitic rocks. Locality:Nigeria, Africa. Name Origin:Named after its locality.Physical Properties: Cleavage:None Color:brown or reddish brown. Density:4.51 Diaphaniety:Opaque Habits:Platy - Sheet forms (e.g. micas)., , Hardness:8.5 - Chrysoberyl Luminescence:Non-fluorescent. Luster:Vitreous - Greasy Streak:grayish whiteMore details...

General Information: Chemical Formula:(Zn,Mg,Fe++)(Sn,Zn)2(Al,Fe+++)12O22(OH)2 Environment:Pegmatitic rocks. Locality:Nigeria, Africa. Name Origin:Named after its locality.Physical Properties: Cleavage:None Color:colorless, amber yellow, golden brown, brown, or red. Density:4.51 Diaphaniety:Opaque Habits:Platy - Sheet forms (e.g. micas)., Hexagonal - Six-sided crystal shape in cross-section or habit., Anhedral Grains - Granular minerals without the expression of crystal shapes Hardness:8.5 - Chrysoberyl Luminescence:Non-fluorescent. Luster:Vitreous - Greasy Streak:grayish whiteMore details...

(Zn,Mg,Fe)(Sn,Zn)2(Al,Fe)12O22(OH)2