Layers of chromite

Part of Hall of Planet Earth.

Layers of chromite_HERO

Chromite is usually one of the first minerals to crystallize in basaltic magma, and is thus commonly found as a layer near the bottom of magma chambers. In this sample, the black, once-flat chromite layer deformed, probably while the rock was still partially molten. 

Provided by Stillwater Mining Company, 
Nye, Montana