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Ushkovite

Year of discovery: 1983 (Bol'shoi Tatkul' Lake, Russia), 1995 (Japan)

Locality list: 4 localities of ushkovite

• MgFe₂(PO₄)₂(OH)₂,8H₂O
• [Mg²⁺][Fe³⁺₂][(OH)₂|(PO₄)₂]^8-,8H₂O

• Class: Laueite group < Laueite supergroup
• Class: Phosphate - Hydroxide - Hydrate

• Mg => Fe: Ferrolaueite
• Mg => Mn: Stewartite, Laueite, Pseudolaueite

• Fe => Al: Gordonite

• Color: Pale yellow, Brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Perfect on {010} (1 plane)
• Hardness: 3.5
• Density: 2.4

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=5.2, b=10.7, c=7.1, α=108.6, β=107.0, γ=72.7