Celestite geode specimen with large blue crystals throughout.
Celestine or celestite is a mineral consisting of strontium sulfate. 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.
Approximate measurements: 12 inches long x 6.5 inches wide by 4.5 inches deep