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Ardennite-(As)

Year of discovery: 1872 (Salmchâteau, Belgium), 1964 (Japan)

Locality list: 8 localities of ardennite-(As)

• Mn²⁺₄MgAl₅(Si₅As)O₂₂(OH)₆
• (Mn²⁺,Ca,Mg)₄(Al,Mg,Mn³⁺)₆(AsO₄,VO₄)(Si₅O₂₂)(OH,O)₆
• [Mn²⁺₄][Al³⁺][Mg²⁺][Al³⁺₄][(OH)₆|AsO₄|(SiO₄)₂|Si₃O₁₀]^25-

• Class: Ardennite group
• Class: Sorosilicate - Nesosilicate - Arsenate - Hydroxide

• AsO₄ => VO₄: Ardennite-(V) (Series)

• Color: Yellow
• Streak: Pale brown
• Luster: Sub-Adamantine
• Diaphaneity: Opaque

• Habit: Prismatic
• Aggregate: Columnar

• Cleavage: Perfect on {010} (1 plane), Distinct on {110} (1 plane), Parting on {001} (1 plane)
• Hardness: 6-7
• Density: 3.7

• System: Orthorhombic
• Group: mmm, Pnmm
• Lattice: a=8.7, b=18.5, c=5.8

Synonym: Ardennite