Seeligerite
| Seeligerite | |
|---|---|
 Seeligerite crystals, from Sierra Gorda, Antofagasta Region, Chile. | |
| General | |
| Category | Iodate minerals |
| Formula (repeating unit) | Pb3Cl3(IO3)O |
| Strunz classification | 4.KB.15 |
| Crystal system | Orthorhombic |
| Crystal class | Disphenoidal (222) H-M symbol: (2 2 2) |
| Space group | C2221 |
Seeligerite is a rare complex lead chlorate iodate mineral with formula: Pb3Cl3(IO3)O. It is a yellow mineral crystallizing in the orthorhombic system. It has perfect to good cleavage in two directions and a quite high specific gravity of 6.83 due to the lead content. It is translucent to transparent with refractive indices of nα=2.120 nβ=2.320 nγ=2.320.
It was first reported in 1971 from the Casucha Mine, Sierra Gorda, Antofagasta Region, Chile.
References
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