Cornetite from its TL – the L’Etoile du Congo Mine, near Lubumbashi, Haut-Katanga, DR Congo


Cornetite has a hardness of 4½ and a specific gravity of 4.10. Named in honor of Mr. Jules Cornet, a Belgian geologist who prospected in the Congo and discovered its immense mineral wealth. Cornetite was the first new mineral discovered in Congo.

It’s been found typically as a rare secondary mineral in some hydrothermal copper deposits in 35 localities worldwide, with 8 in the US, and only 1 in Colorado – at the Cashin Mine in Montrose County. While ColoRockCo has yet to stock any Cornetite from Colorado for you, there is still some native copper and azurite with malachite from the Cashin Mine available today

As with many other Copper minerals, it’s quite blue! Other than that this is a cool specimen with some historic significance pertaining to the rocks of the Congo, and is valuable as a Copper ore (which, would make for a perfect sample for element collectors!), there’s not a whole lot more value to this mineral… But, Copper itself is pretty valuable! So, be sure to keep an eye out for a blue rock like this wherever you are and you might just strike it rich with your new Copper Mine!


There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.

You may also like…