Seeligerite
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Seeligerite is a rare complex lead chloride iodate mineral with formula: Pb3Cl3(IO3)O. It is a yellow mineral crystallizing in the
orthorhombic In crystallography, the orthorhombic crystal system is one of the 7 crystal systems. Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with a r ...
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

Lead minerals Oxide minerals Iodates Orthorhombic minerals Minerals in space group 20 Oxychlorides {{mineral-stub