Double chain Inosilicates

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Riebeckite #1 PPL

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 GET...