lapis lazuli
Isaac Kremer/ September 9, 2018/ / 0 comments
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)