Lindackerite Locality: Jáchymov (St Joachimsthal) , Jáchymov (St Joachimsthal) District, Krušné Hory Mts (Erzgebirge), Karlovy Vary Region , Bohemia (Böhmen; Boehmen) , Czech Republic ( Locality at mindat.org ) Picture width 2 mm. Collection and photograph Christian Rewitzer — Photo: Christian Rewitzer · CC BY-SA 3.0
Lindackerite
Lindackerite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Cu₅(AsO₄)₂(AsO₃OH)₂·9H₂O.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Lindackerite structural group.
Key properties: Mohs hardness 2–2.5; specific gravity 3.35; Pale green to white streak; Vitreous luster; optically biaxial.
IMA symbol Ldk, IMA status: approved, named in 1853.
Found in the oxidized zone of some arsenic-rich copper deposits.
It is found associated with Erythrite, pitticite, annabergite, lavendulan (Jáchymov, Czech Republic); olivenite, chalcanthite, antlerite, pushcharovskite, covellite, tennantite.
The mineral was named to honor Joseph Lindacker, Austrian pharmacist-chemist, who made the first analyses.