Catapleiite: Gemstone Information
Catapleiite is found at Mt Saint Hilaire, Quebec, Canada. The hexagonal crystals show a perfect cleavage with hardness of 6 and SG of 2.72. The RIs are 1.590, 1.609 and 1.629 with a birefringence of 0.039 and positive optic sign. The composition is Na2ZrSi3O92H2O. Only small colourless faceted stones are known.