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Mineralpedia Details for Kottigite

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Kottigite

Kottigite

Named for Otto Kottig, a chemist from Schneeberg, Germany , as the first to describe and publish the description of the mineral. Kottigite is a rare mineral that can be found in oxidized zinc deposits and occurs in localities in Germany, the Czech Republic, Mexico, the United States, Japan, and Australia, among a few others. 

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/kottigite.pdf

Formula
Zn3(AsO4)2ยท8H2
Crystal System
Monoclinic 
Crystal Habit
Prismatic, Massive - Fibrous, Encrustations 
Luster
Silky 
Color
red, brownish 
Class
Monoclinic - Prismatic 
Hardness
2.5-3 
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Kottigite from Mina Ojuela, Mapimi, Durango, Mexico

Kottigite
            from Mina Ojuela, Mapimi, Durango, Mexico

Silvery blue, long bladed crystals to 6mm in a divergent spray.

Bluish grey, long, thin bladed crystals to 4mm in large radial sprays to over 7mm.

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Kottigite from Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States

Kottigite
            from Sterling Hill mine, Ogdensburg, Sussex Co., New Jersey, United States

Deep metallic blue elongated blades in a radial habit to 1.5cm flat on an oxidized fracture plane perhaps with at least one Pharmacosiderite cluster. See prov. tab.

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