The first of the two ores here described, found in Cornwall, is a new combination of chloride of copper, sulphate of copper, and water. It occurs in beautiful small deep blue acicular crystals, of high lustre, grouped in bundles. The quantity was too small for a quantitative analysis.

The other is essentially a double carbonate of zinc and copper. It is from Matlock. It is pale-green, with a laminated structure and pearly lustre. In the qualitative examination of it, the author observed indications of one, or even of more than one, metallic oxide, which he could not identify satisfactorily with any known substance. This oxide was found to adhere to the copper, when that metal was precipitated by sulphuretted hydrogen. When the sulphuret was dissolved in aqua regia, and precipitated at a boiling heat by potash, the new oxide remained dissolved in the alkali, and the solution yielded on evaporation a small quantity of a soluble salt of a beautiful orange-yellow colour.