Charoite
Formula:(K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2O
Colour: Violet to deep lilac Lustre: Vitreous, Silky Hardness: 5 – 6 Specific Gravity: 2.540 Crystal System: Monoclinic
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