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Hessite

Year of discovery: 1843 (Second Zavodinskii mine, Kazakhstan), 1935 (Japan)

Locality list: 36 localities of hessite

• Ag₂Te
• [Ag⁺₂][Te]^2-

• Class: Telluride
• Soluble in: HCl
• Transit ot cubic phase above 155 degree

• Te => S: Acanthite, Argentite
• Te => Se: Naumannite

• Te2 => TeS: Cervelleite

• Color: Lead gray
• Tarnish: Black
• Streak: Gray
• Luster: Metallic
• Diaphaneity: Opaque

• Habit: Pseudocubic
• Twin: Twin lamellae

• Cleavage: Indistinct on {100} (1 plane)
• Hardness: 2-3
• Density: 8.3

• System: Monoclinic
• Group: 2/m, P2₁/c
• Lattice: a=8.1, b=4.5, c=8.1, β=112.9

Etymology: Germain Henri Hess (1802-1850), Russian chemist