Formula: Cu19(SO4)(OH)32Cl4 · 3H2O

Colour: Blue, blue-green; blue in transmitted light.

Lustre: Sub-Vitreous

Hardness: 3

Specific Gravity: 3.36

Crystal System: Hexagonal

Member of: Connellite-Buttgenbachite Series. A relatively uncommon secondary copper mineral.

Name: Named by James Dwight Dana in 1850 in honor of Arthur Connell [1794-1863], professor of chemistry at St Andrew’s University, Edinburgh, Scotland, who first studied the mineral.

Type Locality: Wheal Providence, Providence Mines, Carbis Bay, St Ives, Cornwall, England, UK

Isostructural with: Buttgenbachite