is a grey to reddish silver white nickel arsenide
mineral. It crystallizes in the tetragonal crystal system
. It occurs in hydrothermal
veins alongside other nickel arsenide and sulfide minerals. It is metallic and opaque with a hardness
of 5 and a specific gravity
of 7.83. It is also known as placodine and Temiskamite. The unit cell is of symmetry group P41
It has the chemical formula: Ni11As8 and commonly contains copper, iron, cobalt, antimony, and sulfur as impurities.
It was discovered in 1913 in Eisleben, Germany and was named after Wilhelm Maucher (1879-1930), a German mineral collector.