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Arsenmedaite

Year of discovery: 2019 (Molinello mine, Italy)

Locality list:

• Mn₆AsSi₅O₁₈(OH)
• (Mn,Ca)₆(As,V)Si₅O₁₈(OH)
• [Mn²⁺₆][As⁵⁺][OH|Si₅O₁₈]^17-

• Class: Sorosilicate - Hydroxide

• As => V: Medaite

• Color: Orange, Red
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Good on {100} (1 plane), Parting on {011} (1 plane)
• Density: 3.8

• System: Monoclinic
• Group: 2/m, P2₁/n
• Lattice: a=6.7, b=29.0, c=7.6, β=95.5