Arsenohauchecornite Locality: Vermilion Mine, Denison Township, Sudbury District, Ontario, Canada Dimensions: 1.7cm x 1.0cm x 0.7cm Desciption: Arsenohauchecornite is a very rare Ni-Bi-As sulfosalt (3 localities worldwide - MINDAT) and this famous Canadian mine is the Type Locality. Irregular masses and microcrystals of bronze-metallic arsenohauchecornite are noted on three sides of the thumbnail matrix. A couple of chalcopyrites are also noted. This is a rich example of this rarity. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Arsenohauchecornite
Arsenohauchecornite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Ni₁₈Bi₃AsS₁₆.
It crystallizes in the tetragonal crystal system (space group P4/mmm). It is a member of the hauchecornite structural group.
Key properties: specific gravity 6.35; Metallic, brilliant on fresh surfaces. R1 –R2: (470) 41.6–43.0, (546) 46.2–47.1, (589) 48.2–49.2, (650) 50.8–51.6 luster.
IMA symbol Ahau, IMA status: approved, named in 1978.
Found in hydrothermal Ni–Co–Cu sulfide veins.
It is found associated with Chalcopyrite, pyrrhotite, gersdorffite, pyrite, gold, nickeline, galena, copper, sperrylite, michenerite, froodite (Vermilion mine, Canada).
Alludes to its chemical relation to the hauchecornite group.