Chariots on Fire introduces: 

Lapis-Lazuli

Of a deep, intoxicatingly-saturated blue, lapis-lazuli forms in crystalline limestones as a product of pressurized heat; at times, it may be constellated with flecks of mica in the way of a night-sky.

Aesthetic use of the stone persists from antiquity.  Ancient Egyptians valued the stone as an intuitive, visionary conduit; in powdered form, it was applied around the eyes to reveal latent truths. Ground lapis was used to create the deep-blue pigment known as ‘ultramarine.’