Celestite Crystal Heart

Celestine (the IMA-accepted name) or celestite is a mineral consisting of strontium sulfate (SrSO4). The mineral is named for its occasional delicate blue color. Celestine and the carbonate mineral strontianite are the principal sources of the element strontium, commonly used in fireworks and in various metal alloys.

The blue celestite that most people are familiar with comes from Northwestern Madagascar. Large crystals and geodes are frequently found there. This famous Madagascar locality discovered in 1967 has an annual production of about 15 tons of the material.