Here's another set of gem/mineral names that keeps tripping me up: Lapis lazuli is a rock that contains masses of the deep blue mineral lazurite. Lazulite is an entirely different blue mineral that has nothing to do with lapis lazuli or lazurite.Here's another set of gem/mineral names that keeps tripping me up: Lapis lazuli is a rock that contains masses of the deep blue mineral lazurite. Lazulite is an entirely different blue mineral that has nothing to do with lapis lazuli or lazurite.

then there's Larimar . . . a rare blue variety of the silicate mineral pectolite often sold in the Dominican Republic.