Formula: CaCu₄(SO₄)₂(OH)₆ · 3H₂O

Species: Sulfates

Colour: Green, bluish-green; green in transmitted light.

Lustre: Vitreous, Sub-Vitreous, Pearly

Hardness: 2½

Specific Gravity: 3.084

Crystal System: Monoclinic

Member of: Devilline group. The calcium analogue of lautenthalite and campigliaite. Visually very similar to orthoserpierite and bladed serpierite.

Name: Named in 1872 by Félix Pisani in honor of Henri Étienne Sainte-Claire Deville [March 11, 1818 Saint Thomas, Virgin Islands – July 1, 1881 Boulogne, Hauts-de-Seine, Ile-de-France, France], French chemist. He was professor of chemistry at the University of Besançon from 1845 – 1851. In 1851-1859, he was professor of chemistry at École Normale Supérieure in Paris. He became professor of chemistry at the Sorbonne in 1859 – 1881. Deville discovered the first economical process to refine aluminum.

Type Locality: Cornwall, England, UK