Formula: Na₂Cu(SO₄)₂ · 2H₂O

Species: Sulfates

Name:   in honor of Johann Berthold Christian Kröhnke  , chemist who was working in Chile and first analyzed the mineral. He later became a German consul to Chile.

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

Color: Blue, greenish-blue; light blue to colourless in transmitted light

Lustre: Vitreous

Hardness: 2½ – 3

Density: 2.90

Crystal System: Monoclinic

Member of: Roselite Group