Tag: riebeckite
Riebeckite thin section
For Emil Riebeck (1853-1885), German explorer.
Formula: ▯ Si8O22(OH)2
System: Monoclinic
Color: Usually black, also commonly light blue to blue-black, gray-blue, gray, brown
Lustre: Vitreous, Sub-Vitreous
Hardness: 5–5½
Density: 3.28–3.44
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