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Triploidite

Year of discovery: 1878 (Fillow quarry (Branchville quarry), USA), 1977 (Japan)

Locality list: 2 localities of triploidite

• Mn₂PO₄(OH)
• (Mn,Fe)₂PO₄(OH)
• [Mn²⁺₂][OH|PO₄]^4-

• Class: Phosphate - Hydroxide
• Soluble in: HCl, HNO₃, H₂SO₄

• Mn => Cu: Libethenite
• Mn => Fe: Wolfeite (Series), Satterlyite
• Mn => Mg: Hydroxylwagnerite, Holtedahlite, Althausite

• Mn₂ => CuZn: Zincolibethenite
• Mn₂ => LiAl: Montebrasite
• Mn₂ => LiFe: Tavorite

• PO₄ => AsO₄: Sarkinite

• OH => O: Joosteite
• OH => F: Triplite

• Color: Reddish brown, Yellowish brown
• Streak: White
• Luster: Adamantine
• Diaphaneity: Transparent-Translucent

• Cleavage: Good on {010} (1 plane), Distinct on {120} (2 planes), Poor on {110} (2 planes)
• Hardness: 4.5-5
• Density: 3.7

• System: Monoclinic
• Group: 2/m, P2₁/b
• Lattice: a=12.4, b=13.3, c=9.9, β=108.2