Hold nuummite up to the light and it fractures into gold, sometimes even hints of blue or green, moving across an otherwise dark, almost black body.
That flash comes from intergrown anthophyllite and gedrite minerals catching light at different angles, the same basic optical effect that gives labradorite its glow, just wrapped in a much darker stone.
What makes it genuinely unusual is its age. Nuummite formed roughly three billion years ago in what's now Greenland, making it one of the oldest known minerals on the planet, older than most complex life.
That deep history is part of why it picked up the nickname sorcerer's stone, said to hold ancient wisdom and offer strong protection to whoever carries it.
If you're wondering how to tell if nuummite is real, genuine pieces show that distinctive golden flash against a truly dark, almost velvety black base, rather than a flat gray or uniformly glittery surface, which is a giveaway for lookalike materials sold under the same name.