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Rammelsbergite

Year of discovery: 1855 (Schneeberg district, Germany), 1953 (Japan)

Locality list: 3 localities of rammelsbergite

• NiAs₂
• [Ni²⁺][As₂]

• Class: Marcasite group
• Class: Arsenide

• Polymorph: Pararammelsbergite (Orthorhombic), Krutovite (Cubic)

• Ni => Cu: Paxite
• Ni => Co: Safflorite, Clinosafflorite
• Ni => Fe: Löllingite (Lollingite)
• Ni => Os: Omeiite
• Ni => Ru: Anduoite
• Ni => Pt: Sperrylite

• As => S: Vaesite
• As => Se: Kullerudite, Penroseite
• As => Sb: Nisbite

• Color: Silver white with a pink tint
• Streak: Grayish black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Prismatic elongated to [010], Fiburous
• Aggregate: Radial
• Twin: {101}

• Cleavage: Good on {101} (2 planes)
• Hardness: 5.5-6
• Density: 7.1

• System: Orthorhombic
• Group: mmm, Pnnm
• Lattice: a=4.8, b=5.8, c=3.5

Etymology: Karl Friedrich Rammelsberg (1813-1899), German mineralogist