[ Top ] [ Japanese ]

Pennantite

Year of discovery: 1946 (Benallt mine, UK), 1986 (Japan)

Locality list: 13 localities of pennantite

• Mn₅Al₂Si₃O₁₀(OH)₈
• [Mn²⁺₅][Al³⁺][(OH)₈|AlSi₃O₁₀]^13-

• Class: Chlorite group
• Class: Phyllo-Aluminosilicate - Hydroxide

• Mn => Mg: Clinochlore
• Mn => Ni: Nimite
• Mn => Fe: Chamosite, Orthochamosite

• Color: Orange, Reddish brown, Dark green
• Streak: Yellowish brown
• Luster: Waxy, Pearly
• Diaphaneity: Translucent

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 2-2.5
• Density: 3.1

• System: Triclinic
• Lattice: a=5.5, b=9.5, c=14.4, α=90.0, β=97.2, γ=90.0