Trolleite Polished Freeform, Brazil

Troilite can be found as a native mineral on Earth but is more abundant in meteorites, in particular, those originating from the Moon and Mars. It is among the minerals found in samples of the meteorite that struck Russia in Chelyabinsk on February 15th, 2013. Troilite is extremely rarely encountered in the Earth's crust. Most troilite on Earth is of meteoritic origin.