Lapis Lazuli

As Lapis Lazuli (Arabic and Latin-blue stone) is composed of several minerals-in addition to lazurite (25-40 percent), including augite, calcite, diopside, enstatite, mica, hauinite, hornblende, nosean, sodalite, and/or pyrite--it is considered to be not a mineral, but a rock. The variation in composition also causes a wide range in the above data. The coloring agent is sulfur. In the best quality-specimens, the color is evenly distributed, but in general it is spotty, or striated. In the Lapis Lazuli from Chile (Chilean Lapis) and from Russia, a strongly protruding whitish or grey calcite diminishes the value. Well distributed fine pyrite is advantageous and is taken to show genuiness. Too

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