#CEL-470D Celestite specimen, approximately 2 - 2.25 inches long, and 0.19 pound in weight. Each one unique. Sold by the each.
Chemical Composition: Celestite is strontium sulfate, sometimes with much Barium. Hardness: 3 - 3 1/2 Occurrence: Sky-blue colored brittle clusters of crystals, orthorhombic in structure, transparent to translucent.