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Mangano-cummingtonite (Photo)

Year of discovery: 1938 (Tirodi mine, India), 1938 (Japan)

Locality list: 49 localities of mangano-cummingtonite

• Mn₂Mg₅Si₈O₂₂(OH)₂
• Mn₂(Mg,Fe)₅Si₈O₂₂(OH)₂
• [][Mn²⁺₂][Mg²⁺₅][(OH)₂|(Si₄O₁₁)₂]^14-

• Class: Mg-Fe-Mn amphibole subgroup < w(OH,F,Cl)-dominant amphibole group < Amphibole supergroup
• Class: Inosilicate (Double chain) - Hydroxide
• Fluorescence: UV excitation (Red)
• Impossible to distinguish from Mn bearing tremolite optically.

• Mg => Fe: Mangano-grunerite (Series), Proto-ferro-suenoite

• Mn => Mg: Cummingtonite, Anthophyllite, Proto-anthophyllite
• Mn => Ca: Tremolite, Actinolite

• Color: Pale brown, Pale green, Yellowish brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Acicular, Prismatic

• Cleavage: Perfect on {110} (2 planes, 120 degree), Indistinct on {100} (1 plane)
• Hardness: 5-6
• Density: 3.1

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=9.7, b=18.0, c=5.3, β=103.5

Synonym: Tirodite