AM_Lavendulan
Formula: Na Ca Cu5 As4 O21 Cl H10
Name: Lavendulan
Unit cell: 10.011 19.478 10.056 90.0 90.37 90.0 , V=1960.82
Space group: P121/N1 (14)

Giester G , Kolitsch U , Leverett P , Turner P , Williams P A , European Journal of Mineralogy , 19 (2007) p.75-93, The crystal structures of lavendulan, sampleite, and a new polymorph of sampleite, Locality: Hilarion mine, Lavrion, Greece