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Riebeckite
Name
Riebeckite
Chemical
Formula
[][Na2][(Fe2+)3(Fe3+)2][(OH)2|Si8O22]
Species
Silicates
Crystal
System
Monoclinic
Mohs
Scale
5
Color
Usually black, also commonly light blue to blue-black, gray-blue, gray, brown
Luster
Vitreous, Sub-Vitreous