Seeligerite

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Seeligerite
Seeligerita 01.JPG
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
Disphenoidal class
Identification
Crystal symmetry Orthorhombic
H-M symbol: (2 2 2)
Space group: C 2221

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.

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