Seeligerite

Seeligerite
Seeligerite crystals, from Sierra Gorda, Antofagasta Region, Chile.
General
Category	Iodate minerals
Formula (repeating unit)	$Pb 3 Cl 3 (IO 3)O$
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: $Pb 3 Cl 3 (IO 3)O$ . 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

Mindat with occurrence
Webmineral

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