Edingtonite is a white, gray, brown, colorless, pink or yellow zeolite mineral. Its chemical formula is BariumAluminium2Silicon3Oxygen10·4water. It has varieties with tetragonal, orthorhombic or triclinic crystals.[Richard V. Gaines, H. Catherine W. Skinner, Eugene E. Foord, Brian Mason, and Abraham Rosenzweig: "Dana's new mineralogy", pp. 1683-1684. John Wiley & Sons, 1997]
The mineral occurs within cavities in nepheline syenites, , in
hydrothermal veins and various mafic rocks. It occurs associated with thomsonite, analcime, natrolite, harmotome, brewsterite, prehnite and calcite.[
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The mineral was first reported by and named for Scottish mineral collector James Edington (1787–1844). Other sources (including the mineralogist Haidinger) credit Scottish geologist and mineralogist Thomas Edington (1814-1859). However, as the mineral was named in 1825, the former accreditation must be the true one.[Wilhelm Karl von Haidinger, "Description of Edingtonite, a New Mineral Species", in The Edinburgh Journal of Science, V. iii, October 1825, pp. 316–320]
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