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Tokyoite

Year of discovery: 2004 (Japan as the first occurence in the World)

Locality list: 2 localities of tokyoite

• Ba₂Mn(VO₄)₂(OH)
• Ba₂(Mn,Fe)(VO₄)₂(OH)
• [Ba²⁺₂][Mn³⁺][OH|(VO₄)₂]^7-

• Class: Vanadate - Hydroxide

• Ba => Pb: Brackebuschite

• Mn => Fe: Gamagarite

• Color: Dark red
• Streak: Dard reddish brown
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Granular

• Cleavage: No
• Hardness: 4-4.5
• Density: 4.6

• System: Monoclinic
• Group: 2/m, P2₁/m
• Lattice: a=9.1, b=6.1, c=7.9, β=112.2

EtymologyName: Tokyo metropolis, Japan, the address of Shiromaru mine, where this mineral was discovered for the first time.