A hard, tough, and compact rock of a rich azure blue color, mottled with gray, and with a vitreous luster. Of a very complex chemical nature. Occurs in granular limestone and syenitic rocks, but only in small masses, and is quite expensive. Commercial sources, Persia, Siberia, and China. (Sturgis, 1900)
« Back to Glossary Indexlapis lazuli
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