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Edingtonite from Ice River Alkaline Complex, Golden Mining Division, British Columbia, Canada
Category Tectosilicate
(repeating unit)
Strunz classification 9.GA.15
Crystal system Orthorhombic, some are tetragonal
Mohs scale hardness 4 - 5
Optical properties Biaxial (-)
Refractive index nα = 1.538 nβ = 1.549 nγ = 1.554
Birefringence δ = 0.016
2V angle Calculated: 66°
References [1][2]

Edingtonite is a white, gray, brown, colorless, pink or yellow zeolite mineral. Its chemical formula is BaAl2Si3O10·4H2O. It has varieties with tetragonal, orthorhombic or triclinic crystals.[3]

Whilst some claim it was named after Scottish mineral collector James Edington (1787–1844),[2] most sources (including the knowledgable mineralogist Haidinger) credit Thomas Edington FRSE (1814-1859), a Scottish geologist and mineralogist of greater fame.[4]


  1. ^ Edingtonite mineral data from Webmineral
  2. ^ a b Edingtonite mineral data from Mindat.org
  3. ^ 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
  4. ^ BIOGRAPHICAL INDEX OF FORMER FELLOWS OF THE ROYAL SOCIETY OF EDINBURGH 1783 – 2002 (PDF). The Royal Society of Edinburgh. July 2006. ISBN 0 902 198 84 X. 

External links[edit]

Media related to Edingtonite at Wikimedia Commons