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Pyrochroite (Photo)

Year of discovery: 1864 (Pajsberg mine, Sweden), 1938 (Japan)

Locality list: 41 localities of pyrochroite

• Mn(OH)₂
• [Mn²⁺][(OH)₂]^2-

• Class: Brucite group
• Class: Hydroxide
• Oxidized to Feitknechtite readily under ambient condition.
• Alter to Bixbyite.
• Substitution pseudomorph: Replace Manganosite.

• Mn => Mg: Brucite
• Mn => Fe: Amakinite
• Mn => Ca: Portlandite
• Mn => Ni: Theophrastite

• Color: Colorless, Pale blue
• Tarnish: Brown-Black (Readily by oxidation)
• Streak: White
• Luster: Pearly
• Diaphaneity: Translucent-Opaque

• Habit: Earthy

• Cleavage: Perfect on {0001} (1 plane)
• Hardness: 2.5-3
• Density: 3.3

• System: Trigonal
• Group: (-3)m, P(-3)m1
• Lattice: a=3.3, c=4.7