Covellite - a new copper mineral that I recently learned about and am officially obsessed with! It is an iridescent midnight blue color with flashes of purple and green, it is truly amazing!

First discovered at Mount Vesuvius by Nicola Covelli (according to Wikipedia). It truly looks like a stone that would come from a volcano.

The cut of this stone is very interesting, a kind of tapered rectangle.

What do you guys think?