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Scapolite is a name used for a group of aluminosilicate minerals that includes meionite, marialite, and silvialite. It has a refractive index of 1.54 – 1.58 and a hardness of 5 - 6 on the Mohs scale. This beautiful piece of Purple Scapolite from Tanzania weighs 5.59 cts measures 15x8x6mm and has some small viels.