‘Galactic Gold’ is a variant of the Guatemalan black jade flecked with pyrite.
Rough and cut Guatemalan black jade w/pyrite inclusions. 
Pyrite and possibly other metallic inclusions in this mottled green/black jade from Guatemala. 
This unpromising river rock is in fact Guatemalan Black Jadeite. Both the unpolished slab below, and the polished slab above, were taken from the brown rock in the center.