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Villyaellenite

Year of discovery: 1984 (Ste Marie-aux-Mines, France), 1996 (Japan)

Locality list: 0 localities of villyaellenite

• Ca₂Mn₃(HAsO₄)₂(AsO₄)₂,4H₂O
• (Mn,Ca)₅(HAsO₄)₂(AsO₄)₂,4H₂O
• [Ca²⁺₂][Mn²⁺][Mn²⁺₂][(HAsO₄)₂|(AsO₄)₂]^10-,4H₂O

• Class: Hureaulite group
• Class: Arsenate - Hydrate

• Ca => Mn: Miguelromeroite

• Mn => Ca: Sainfeldite

• Mn₃ => Ca₂Mg: Irhtemite

• Color: Colorless, Yellowish brown, Pink
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Acicular

• Cleavage: Good on {100} (1 plane)
• Hardness: 4
• Density: 3.2

• System: Monoclinic
• Group: 2/m, C2/c
• Lattice: a=18.6, b=9.5, c=10.0, β=96.9