[ Top ] [ Japanese ]

Stewartite

Year of discovery: 1912 (Stewart mine, USA), 1996 (Japan)

Locality list: A locality of stewartite

• MnFe₂(PO₄)₂(OH)₂,8H₂O
• [Mn²⁺][Fe³⁺₂][(OH)₂|(PO₄)₂]^8-,8H₂O

• Class: Phosphatee - Hydroxide - Hydrate

• Polymorph: Laueite (Triclinic), Pseudolaueite (Monoclinic)

• Mn => Fe: Ferrolaueite
• Mn => Mg: Ushkovite

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

• Cleavage: Good
• Hardness: 3
• Density: 2.9

• 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