Hauerite

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A sample of Hauerite
A sample of Hauerite

Hauerite is a manganese sulfide mineral with the chemical formula MnS2. It forms reddish brown or black octahedral crystals and it is usually found associated with the sulfides of other transition metals such as rambergite. It was discovered in Austria and named after the mineralogists, J.R. Hauer and F. Hauer.