Celestine or Celestite crystal from Madagascar held in a hand

Celestine is an attractive mineral that forms in well-shaped crystals with a distinctive soft blue color. Crystals may be a solid color, but may also have lighter and darker color zones of blue. While pure Celestine is colorless, various impurities give this mineral a wider range of colors, especially its celestial blue color. Celestine geodes of large, deep sky-blue crystals are well-known and abundant from Madagascar. Celestine is isomorphous with Barite, and may partially replace it. One specimen may even be part Barite and part Celestite within a single crystal. Celestine is named from the Latin term caelestis, alluding to it typical celestial sky-blue color.

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