Edingtonite

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Edingtonite
Edingtonite-120476.jpg
Edingtonite from Ice River Alkaline Complex, Golden Mining Division, British Columbia, Canada
General
Category Tectosilicate
Formula
(repeating unit)
BaAl2Si3O10·4H2O
Strunz classification 9.GA.15
Crystal system Orthorhombic, some are tetragonal
Identification
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]

References[edit]

  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