Celestite
Mineral that is a naturally occurring form of strontium sulfate (SrSO4). It resembles barite, barium sulfate, but is much less common. Barium is interchangeable with strontium in the crystal structure; there is a gradation between celestite and barite. Celestite occurs in sedimentary rocks, particularly dolomites and dolomitic limestones, throughout the world
posted by BentSchool @ 2:44 AM
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