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Canfieldite

Year of discovery: 1893 (Colquechaca (Aullagas), Bolivia), 1969 (Japan)

Locality list: 17 localities of canfieldite

• Ag₈SnS₆
• Ag₈(Sn,Ge)(S,Te)₆
• [Ag⁺₈][Sn⁴⁺][S₆]^12-

• Class: Argyrodite series
• Class: Sulfide
• Insoluble in: HCl

• Sn => Ge: Argyrodite (Series)

• Color: Reddish steel gray
• Tarnish: Bluish to purplish black
• Streak: Grayish black
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Pseudooctahdron, Pseudododecahdron
• Twin: {111} spinel twin of octahedron, periodical intrusive twin of dodecahedron

• Cleavage: No
• Hardness: 2.5
• Density: 6.3

• System: Orthorhombic, Pseudoisometric
• Group: mm2, Pna2₁
• Lattice: a=15.3, b=7.5, c=10.7

Etymology: Frederick Alexander Canfield (1849-1926), collector and mining engineer from Dover, New Jersey, USA