Maucherite

Maucherite 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 P4₁2₁2 or P4₃2₁2.

Maucherite
Cubanite-maucherite-valleriite
General
Category	Arsenide mineral
Formula	Ni11As8
IMA symbol	Muc[1]
Strunz classification	2.AB.15
Crystal system	Tetragonal
Crystal class	Trapezohedral (422) (same H-M symbol)
Space group	P41212, P43212
Identification
Color	grey to reddish silver white
Mohs scale hardness	4.5–5.5
Streak	grayish black
Specific gravity	6.9–7.3
References	[2]

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.