Formula: NaCu₂(SO₄)₂(OH) · 2H₂O

Species: Sulfates

Name: In allusion to the composition, containing sodium (Latin = NATRium) and copper (CHALCo-)

Type Locality: Chuquicamata Mine, Chuquicamata District, Calama, El Loa Province, Antofagasta, Chile

Color: Bright green; green in transmitted light.

Lustre: Vitreous

Hardness: 4½

Density: 3.47 – 3.51

Crystal System: Monoclinic

Member of: Tsumcorite Group