Mineralpedia Details for Kottigite

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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)₂·8H₂O
Crystal System: Monoclinic
Crystal Habit: Prismatic, Massive - Fibrous, Encrustations
Luster: Silky
Color: red, brownish
Class: Monoclinic - Prismatic
Hardness: 2.5-3
WebMineral: View Kottigite
Mindat: View Kottigite

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.

Click thumbnail images for larger view.

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.