Edingtonite
| Edingtonite | |
|---|---|
Edingtonite from Ice River Alkaline Complex, Golden Mining Division, British Columbia, Canada
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| General | |
| Category | Tectosilicate |
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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 | |
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.
Whilst some claim it was named after Scottish mineral collector James Edington (1787–1844), most sources (including the knowledgable mineralogist Haidinger) credit Thomas Edington FRSE (1814-1859), a Scottish geologist and mineralogist of greater fame.
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