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Tsugaruite (Photo)

Year of discovery: 1998 (Japan as the first occurence in the World)

Locality list: A locality of tsugaruite

• Pb₄As₂S₇
• [Pb²⁺₄][As³⁺₂][S₇]^14-

• Class: Jordanite group < Large 2D fragment Pb sulfosalts < Sulfosalt class
• Class: Sulfosalt

• Color: Dark gray, Iron black
• Streak: Dark gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Acicular
• Aggregate: Radial

• Cleavage: No
• Hardness: 2.5-3

• System: Orthorhombic
• Group: 222, Pba2
• Lattice: a=15.2, b=38.1, c=8.1

Etymology: Tsugaru district in Aomori prefecture, Japan, the address of Yunosawa mine where this mineral was discovered for the first time.