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Watatsumiite

Year of discovery: 2002 (Japan as the first occurence in the World)

Locality list: A locality of watatsumiite

• Na₂KLiMn₂V₂Si₈O₂₄
• Na₂KLi(Mn,Fe)₂V₂Si₈O₂₄
• [Na⁺₂][K⁺][Li⁺][Mn²⁺₂][V⁴⁺₂][(SiO₃)₈]^16-

• Class: Neptunite group
• Class: Inosilicate (Single chain)
• Radioactive: Very weak

• V => Ti: Manganoneptunite

• Color: Yellowish green
• Streak: Pale green
• Luster: Vitreous
• Diaphaneity: Transparent

• Habit: Granular, Short prismatic

• Cleavage: Indistinct on {110} (2 planes)
• Hardness: 5.5-6

• System: Monoclinic
• Group: m, Cc
• Lattice: a=16.5, b=12.5, c=10.0, β=115.3

Etymology: Watatsumi, an old Japanese term meaning a god of sea