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Proto-anthophyllite

Year of discovery: 2001 (Japan as the first occurence in the World)

Locality list: A locality of proto-anthophyllite

• Mg₇Si₈O₂₂(OH)₂
• (Mg,Fe)₇Si₈O₂₂(OH)₂
• [][Mg²⁺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

• Polymorph: Anthophyllite (Orthorhombic), Cummingtonite (Monoclinic)

• Mg => Fe: Ferro-anthophyllite, Grunerite, Proto-ferro-anthophyllite

• Mg₂ => Mn₂: Mangano-cummingtonite
• Mg₂ => Ca₂: Tremolite, Actinolite

• Color: Colorless, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Habit: Acicular, Prismatic

• Cleavage: Perfect on {110} (2 planes)
• Hardness: 6
• Density: 3.0

• System: Orthorhombic
• Group: mmm, Pnmn
• Lattice: a=9.4, b=17.9, c=5.3