Rare secondary mineral in vugs in massive nitrate rock.
IMA Status:
Valid Species (Pre-IMA) 1937
Locality:
In Chile, in Tarapaca, from Oficina Rosario, Huara, Pampa del Iquique; Oficina Maria Elena, near Tocopilla, Pampa del Tocopilla; and at Zapiga. Link to MinDat.org Location Data.
Name Origin:
Named for Emiliano Lopez Saa (1871-1959), Iquique, Chile, Chilean mining engineer and mineral collector long associated with the Chilean nitrate industry.
Chemical Formula: 