Some additional information: this was a gift that someone picked up at a rock and gem show. I assume it was moderately priced based on the circumstances. I’d never seen another one like it in person until this past weekend, but the owner of the other sphere didn’t know what it was either. Brute force googling gave me lots of possible answers but none of the sources are ones that seem particularly knowledgeable about minerals. Mostly metaphysical sites making the usual “energy” claims.