Very strong blue color, sometimes violet, it presents unctuous to vitreous gloss, and it has 5 to 5.5 hardness.
Badakhshan Province, Afghanistan.
Lazurite is the blue component of the ‘precious stone’ (or, more precisely, decorative rock) Lapis-Lazuli, which is a rock comprised by Lazurite, Calcite and Pyrite. In the past, lazurite was widely used as blue and violet pigment, currently, it is replaced by synthetic products.
Lapis-Lazuli rock has been mined since Ancient History in Afghanistan, and it is used in jewelry and sculpture fields. In India, it has been used since before 7000 B.C.
Source: MM Gerdau - Museu das Minas e do Metal -