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Proto-ferro-suenoite

Year of discovery: 1986 (Japan as the first occurence in the World)

Locality list: 2 localities of proto-ferro-suenoite

• Mn₂Fe₅Si₈O₂₂(OH)₂
• (Mn,Fe)₂(Fe,Mg)₅Si₈O₂₂(OH)₂
• [][Mn²⁺₂][Fe²⁺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

• Polymorph: Mangano-grunerite (Monoclinic)

• Mn => Fe: Grunerite, Ferro-anthophyllite, Proto-ferro-anthophyllite
• Mn => Ca: Ferro-actinolite
• Mn => Na: Riebeckite

• Fe => Mg: Mangano-cummingtonite

• Color: White, Grayish brown
• Streak: Gray
• Luster: Vitreous
• Diaphaneity: Transparent

• Habit: Acicular, Prismatic

• Cleavage: Perfect on {210} (2 planes, 120 degree)
• Hardness: 5.5-6
• Density: 3.5

• System: Orthorhombic
• Group: mmm, Pnmn
• Lattice: a=9.4, b=18.3, c=5.3

Etymology: Professor Shigeho Sueno (-2001), Japanese mineralogist of Tsukuba university, who described this mineral for the first time.

Synonym: Proto-mangano-ferro-anthophyllite