Formula: NaCaCu₅(AsO₄)₄Cl · 5H₂O

Species: Arsenates

Colour: Turquoise-blue, greenish blue, pale blue

Lustre: Vitreous, Waxy

Hardness: 2½

Specific Gravity: 3.54

Crystal System: Monoclinic

Member of: Lavendulan Group

Name: Named after the lavender colour of the “type” specimen, which has been determined to be a mixture with no relationship to modern lavendulan (Ondruš et al., 2006). Lavendulan does not exhibit a lavender colour.

Type Locality: Jáchymov, Karlovy Vary District, Karlovy Vary Region – Czech Republic

Dimorph of: Lemanskiite

Isostructural with: Sampleite

A polymorph of Lemanskiite, the Ca analogue of Zdenekite and the arsenate analogue of Sampleite. Compare also the chemically and visually similar mahnertite. May appear visually similar to slavkovite.