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Kësterite, Kesterite

Year of discovery: 1956 (Këster deposit, Russia), 1977 (Japan)

Locality list: 6 localities of kësterite

• Cu₂ZnSnS₄
• Cu₂(Zn,Fe)SnS₄
• [Cu⁺₂][Zn²⁺][Sn⁴⁺][S₄]^8-

• Class: Stannite group
• Class: Sulfide

• Cu => Ag: Pirquitasite

• Zn => Fe: Ferrokësterite (Ferrokesterite), Stannite (Series)
• Zn => Cu: Petrukite, Kuramite
• Zn => Hg: Velikite
• Zn => Cd: Černýite (Cernyite)

• Sn => Ge: Briartite

• Color: Greenish black
• Streak: Black
• Luster: Metallic
• Diaphaneity: Opaque

• Cleavage: No
• Hardness: 4.5
• Density: 4.6

• System: Tetragonal, Pseudocubic
• Group: (-4), I(-4)
• Lattice: a=5.4, c=10.9

Etymology: Këster (Kester) deposit in Russia