Celestite is a strontium sulfate mineral that typically forms blue crystals. Celestine and the carbonate mineral strontianite are the principal sources of the element strontium, commonly used in fireworks, and in various metal alloys. Mohs Hardness: 3 to 3.5 Metaphysical Properties: Highly revered for its high frequency and divine energy, Celestite is known to be a powerful healing crystal. It can relieve stress, anxiety and obsessive behaviors. Celestite is also beneficial for public speaking, or...