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Sterlinghillite

Year of discovery: 1980 (Sterling mine, USA), 1999 (Japan)

Locality list: A locality of sterlinghillite

• Mn₃(AsO₄)₂,4H₂O
• [Mn²⁺₃][(AsO₄)₂]^6-,4H₂O

• Class: Ludlamite group
• Class: Arsenate - Hydrate

• Polymorph: Castellaroite (Monoclinic)

• Mn => Cu: Rollandite

• AsO₄ => PO₄: Metaswitzerite

• Color: Pale pink
• Streak: White
• Luster: Pearly
• Diaphaneity: Translucent

• Cleavage: Perfect
• Hardness: 3
• Density: 3.0

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=10.4, b=10.7, c=7.2, α=90.1, β=109.1, γ=71.8