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Berndtite

Year of discovery: 1964 (Cerro de Potosi (Cerro Rico), Bolivia), 1987 (Japan)

Locality list: A locality of berndtite

• SnS₂
• [Sn⁴⁺][S₂]^4-

• Class: Melonite group
• Class: Sulfide

• Color: Pale Yellow
• Streak: Yellow
• Luster: Resinous
• Diaphaneity: Transparent-Translucent

• Habit: Hexagonal platy

• Cleavage: Good on {0001} (1 plane)
• Hardness: 1-2
• Density: 4.5

• System: Trigonal (2T), Hexagonal (2H) (Layer-stacking polytype)
• Group: (-3)m, P(-3)m1
• Lattice: a=3.6, c=5.9

Etymology: Dr. Fritz Berndt, German mineralogist