Lapis lazuli, also called lapis for short, is a deep-blue rock composed of lazurite, hauyne, sodalite, and nosean that is considered a semi-precious stone. Lapis is valued for its deep blue color, which it gets from the mineral lazurite. Its signature hue is a slightly greenish blue to violet blue. It is medium to dark in tone, and in its most prized form, has no visible calcite. Lapis lazuli with white calcite streaks is considered less valuable.
