Lapis lazuli has been mined in the Andes Mountains, at the headwaters of the Tascadero River in Chili since 1905.  Deposits are located near the border between Chile and Argentina, in the Coquimbo Region of Chile around the 11,500 ft.  This material is composed of blue lazurite, together with white wollastonite, white calcite, blue hauyne, gold-colored pyrite, and minor quantities of other minerals. 
 
A few years back, we purchased the remaining supply of Chilian Lapis from the owner of one of a mines.  Their deposit had been played out, so they decided to liquidate their inventory.  We cut one piece of the material into this 22x20mm triangle-shaped Cabochon set in a Sterling Silver Pendant.