Harker, Robert I. Department of Geology, University of Pennsylvania, Philadelphia, Pennsylvania.
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The mineral form of strontium carbonate, usually with some calcium replacing strontium. It characteristically occurs in veins with barite or celestite or as masses in certain sedimentary rocks. Strontianite has orthorhombic symmetry and the same structure as aragonite. It is normally prismatic with the development of pseudohexagonal form (see illustration), but it may also be massive. It may be colorless or gray with yellow, green, or brownish tints. The hardness is 3.5 on Mohs scale, and the specific gravity is 3.76. It occurs at Strontian, Scotland, and in Germany, Austria, Mexico, and India and, in the United States, in the Strontium Hills of California. See also: Carbonate minerals; Strontium
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