| Seeligerite | |
| Category: | Iodate minerals |
| Formula: | Pb3Cl3(IO3)O |
| Imasymbol: | Sli[1] |
| Strunz: | 4.KB.15 |
| System: | Orthorhombic |
| Class: | Disphenoidal (222) H-M symbol: (2 2 2) |
| Symmetry: | C2221 |
| References: | [2] [3] |
Seeligerite is a rare complex lead chloride 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.[2]
It was first reported in 1971 from the Casucha Mine, Sierra Gorda, Antofagasta Region, Chile.[2]