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lapis lazuli: a blue gem used for cabochons, beads, inlay geology.com news rocks minerals gemstones volcanoes more topics us maps world maps store homepage articles diamonds earthquakes gemstones general geology geologic hazards gold landslides metals meteorites minerals news oil and gas plate tectonics
properties blue color, association with pyrite, and hardness. uses cabochons, beads, carvings, spheres, inlay, and pigments. composition and properties of lapis in addition to lazurite, specimens of lapis lazuli usually contain calcite and pyrite . sodalite , hauyne, wollastonite, afghanite, mica, dolomite...
https://geology.com/gemstones/lapis-lazuli/