Category Iodate minerals Strunz classification 4.KB.15 Space group C2221 | Formula
(repeating unit) Pb3Cl3(IO3)O Crystal system Orthorhombic | |
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Crystal class Disphenoidal (222)
H-M symbol: (2 2 2) | ||
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
Seeligerite Wikipedia(Text) CC BY-SA