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Siegenite

Year of discovery: 1850 (Stahlberg mine, Germany), 1940 (Japan)

Locality list: 21 localities of siegenite

• CoNi₂S₄
• CoNi₂S₄-NiCo₂S₄
• [Co²⁺][Ni³⁺₂][S₄]^8-

• Class: Linnaeite subgroup < Thiospinel group < Spinel supergroup
• Class: Sulfide

• Ni => Co: Linnaeite

• Co => Ni: Polydymite
• Co => Cu: Fletcherite
• Co => Fe: Violarite (Series)

• Color: Light gray
• Streak: Grayish black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Octahedral
• Twin: {111}

• Cleavage: Imperfect on {001} (3 plane)
• Hardness: 4.5-5.5
• Density: 4.5

• System: Cubic
• Group: m3m, Fd3m
• Lattice: a=9.4

Etymology: Siegen district in Germany