Tags: Chemical Substance, Mineral.

Lavendulan is an uncommon copper arsenate mineral known for its characteristic intense electric blue colour. It belongs to the lavendulan group which has four members: Lavendulan NaCaCu5(AsO4)4Cl.5H2O Lemanskiite NaCaCu5(AsO4)4Cl.5H2O Sampleite NaCaCu5(PO4)4Cl.5H2O Zdenĕkite NaPbCu5(AsO4)4Cl.5H2OLemanskiite and lavendulan are dimorphs; they have the same formula but different structures. Lemanskiite is tetragonal but lavendulan is monoclinic.

Lavendulan-Cornwallite-253920.jpg

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