Sodalite is a usually attractive blue colour mineral found in limestones and used for polished slabs and for carved ornaments. It is a chlorosilicate of sodium and aluminium with the formulae Na4Al3(SiO4)3Cl and a relative hardness of 6. Sodalite was confirmed as a distinct species of mineral in 1811 and gets its name from its chief metal - sodium. Research Sodalite
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