Walfordite | |
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General | |
Category | Tellurite minerals |
Formula (repeating unit) | Fe3+,Te6+Te4+3O8 |
IMA symbol | wfd[1] |
Strunz classification | 4.JK.05 |
Crystal system | Isometric |
Space group | I2, Ia3 |
Unit cell | a = 11.011 Å ; Z = 8 |
Identification | |
Colour | Orange |
Crystal habit | Microscopic cubic crystals |
Cleavage | None |
Tenacity | Brittle |
Luster | Adamantine |
Streak | Orange-yellow |
Diaphaneity | Opaque |
Specific gravity | 5.841 (calculated) |
Optical properties | Isotropic |
Refractive index | n = 2.23 |
References | [2][3][4] |
Walfordite is a very rare tellurite mineral that was discovered in Chile in 1999.[5] The mineral is described as orange with orange-yellow streak, and is determined to have a chemical formula of Fe3+,Te6+Te4+3O8[2] with minor titanium and magnesium substitution resulting in an approximate empirical formula of (Fe3+,Te6+,Ti4+,Mg)(Te4+)3O8.[5]