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Messelite

Year of discovery: 1889 (Messel mine, Germany), 1980 (Japan)

Locality list: 2 localities of messelite

• Ca₂Fe(PO₄)₂,2H₂O
• Ca₂(Fe,Mn)(PO₄)₂,2H₂O
• [Ca²⁺₂][Fe²⁺][(PO₄)₂]^6-,2H₂O

• Class: Phosphate - Hydrate

• Fe => Ni: Cassidyite
• Fe => Mg: Collinsite
• Fe => Mn: Fairfieldite
• Fe => Zn: Hillite

• Color: White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {001} (1 plane), Distinct on {010} (1 plane)
• Hardness: 3.5
• Density: 3.2

• System: Triclinic
• Group: (-1), P(-1)
• Lattice: a=5.8, b=6.6, c=5.5, α=102.0, β=109.0, γ=90.0