Formula: NiAs₂

Species:

Colour: Tin white with faint pinkish hue

Lustre: Metallic

Hardness: 5½ – 6

Specific Gravity: 7.0 – 7.2

Crystal System: Orthorhombic

Member of: Löllingite Group

Name: Named in 1855 by James D. Dana in honor of Karl Friedrich August Rammelsberg (1813-1899), German chemist and mineralogist who taught at University of Berlin and at the Royal Industrial Institute. He published many significant books on systematic mineralogy.

Type Locality: Schneeberg, Erzgebirgskreis, Saxony – Germany

Polymorph of: Krutovite, Pararammelsbergite

 with: MIsostructuralarcasite

The high-temperature polymorph of NiAs2; pararammelsbergite is the low-temperature polymorph.