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Ullmannite

Year of discovery: 1843 (Storch und Schöneberg mine, Germany), 1953 (Japan)

Locality list: 3 localities of ullmannite

• NiSbS
• [Ni²⁺][Sb³⁺][S]

• Class: Cobaltite group
• Class: Sulfide

• Ni => Ir: Tolovkite
• Ni => Co: Willyamite (Series), Costibite, Paracostibite
• Ni => Fe: Gudmundite
• Ni => Rh: Andrieslombaardite

• Sb => As: Gersdorffite

• Color: Silver white, Steel gray
• Streak: Dark gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Cube, Octahedra, Dodecahedral, or Tetrahedral
• Striation: [110] on {100}
• Twin: [110] on {001}, penetration

• Cleavage: Perfect on {001} (3 planes)
• Hardness: 5-5.5
• Density: 6.7

• System: Cubic
• Group: 23, P2₁3
• Lattice: a=5.9

Etymology: Johann Christoph Ullmann (1771-1821), German mineralogist who discovered this mineral for the first time.