As a result or more correctly as a function of the fact, they are found in silica poor rocks containing other silica poor minerals and no quartz . Localities that have feldspathoids are few. The name lazurite is often confused with the bright blue phosphate mineral lazulite . However the two minerals can not be confused with each other identification wise because of lazulite's typical vitreous luster and good crystal habit. The carbonate mineral azurite has a very similar color to lazurite but is associated with the green carbonate mineral malachite and reacts to acids.
Color is brilliant blue with violet or greenish tints.
Luster is dull to greasy. Crystals are translucent to opaque. Cleavage is poor, in six directions, but rarely seen. Streak is bright blue. Associated Minerals calcite , some pyroxenes and most diagnostic pyrite .