Published on June 6, 2013 07:46 PM
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Ultramarine is a blue pigment consisting primarily of a zeolite-based mineral containing small amounts of sulfur. Ultramarine is one of the most complex of the mineral pigments, composed of the blue mineral lazurite, which is the major component of the rare and semi-precious stone lapis lazuli. The mineral occurs in nature as a product of limestone metamorphism and typically is associated with calcite, pyrite, diopside, humite, forsterite, hauyne and muscovite minerals, and is sometimes found in lava as a by-product of volcanic eruptions.