Edingtonite
| Edingtonite | |
|---|---|
|
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
- ↑ Edingtonite mineral data from Webmineral
- 1 2 Edingtonite mineral data from Mindat.org
- ↑ 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
- ↑ 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
Media related to Edingtonite at Wikimedia Commons
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