Its name conjures an image of vivid deep blues. But when cobalt is dug out of the ground in ore form, there’s barely a hint of the rich hue it lends its name to. In the Democratic Republic of the Congo, which produces more than half of the world’s supply, it takes the form of heterogenite, a dull brownish mineral that could easily be mistaken for small clods of dirt.

But people die for this mineral. Children suffer for it. Livelihoods, educations, neighborhoods, environments and personal safety are sacrificed for it.