Sodalite Sterling Silver PendantRoyal blue with white veins running through itthe color does not come from dye or coating but from the mineral's own chemistry. Sodalite is a sodium aluminum silicate with chlorine (NaAlSiOCl), and its name comes from its sodium content. The rich blue is intrinsic to the crystal structure; the white veining is calcite or other feldspar inclusions. Mohs hardness 5. 56. Major deposits occur at Bancroft in Ontario, Canada, in Brazil, Greenland, India,