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Legrandite

Year of discovery: 1932 (Flor de Peña mine, Mexico), 1970 (Japan)

Locality list: 2 localities of legrandite

• Zn₂AsO₄(OH),H₂O
• [Zn²⁺₂][OH|AsO₄]^4-,H₂O

• Class: Arsenate - Hydroxide - Hydrate

• Zn => Cu: Strashimirite

• AsO₄ => PO₄: Spencerite

• H₂O => []: Adamite, Paradamite

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

• Cleavage: Imperfect on {100} (1 plane)
• Hardness: 4.5
• Density: 4.0

• System: Monoclinic
• Group: 2/m, P2₁/c
• Lattice: a=12.8, b=7.9, c=10.2, β=104.2