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Lavendulan

Year of discovery: 1837 (Jáchymov, Czech), 2008 (Japan)

Locality list: 2 localities of lavendulan

• NaCaCu₅(AsO₄)₄Cl,5H₂O
• [Na⁺][Ca²⁺][Cu²⁺₅][Cl|(AsO₄)₄]^13-,5H₂O

• Class: Arsenate - Chloride - Hydrate

• Polymorph: Lemanskiite (Tetragonal)

• Ca => Pb: Zdenĕkite (Zdenekite)

• AsO₄ => PO₄: Sampleite (Series)

• Color: Light blue
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Good on {010} (1 plane), Distinct on {100} and {001} (2 planes)
• Hardness: 2.5
• Density: 3.5

• System: Monoclinic
• Group: 2/m, P2₁/n
• Lattice: a=10.0, b=19.5, c=10.1, β=90.4