Vaesite

 Vaesite (NiS₂) is a mineral found together with cattierite in the Democratic Republic of Congo. It is named after Johannes F. Vaes, a Belgian mineralologist.^[1]

Vaesite
Vaesite on a matrix
General
Category	Pyrite Group
Formula (repeating unit)	NiS2
Crystal system	Isometric
Identification
Color	Black, silver-gray
Mohs scale hardness	4,5 - 5,5

This article uses material from the Wikipedia article  Metasyntactic variable, which is released under the  Creative Commons Attribution-ShareAlike 3.0 Unported License.