Niccolite

Name:
Niccolite
Detailed information:

Chemistry name:	arsenical nickel
M Formula:	NiAs
Properties:
Pale-copper-red mineral with dark tarnish, metallic luster. Contains 43.9% nickel. D 7.3–7.67, Mohs hardness 5–5.5. Soluble in concentrated nitric acid.
Hazard:
Toxic by inhalation of dust.