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Franciscanite

Year of discovery: 1985 (Pennsylvania mine, USA), 2007 (Japan)

Locality list: A locality of franciscanite

• Mn₆(V,[])₂(SiO₄)₂O₆
• Mn₆(V,[])₂(SiO₄)₂(O,OH)₆
• [Mn²⁺₆][(V⁵⁺,[])₂][O₆|(SiO₄)₂]^20-

• Class: Nesosilicate - Oxide

• V => (W,Mg): Welinite

• Color: Reddish brown
• Streak: Reddish brown
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: No
• Hardness: 4

• System: Hexagonal
• Lattice: a=8.2, c=4.8