* I think these are man made* Fulgurite Sphere. Also known as Lightning Glass, these delicate, root-like formations are created when lightning strikes rock, instantly melting and fusing the stone into a preserved model of the lightning.
Malachite "pillars" between two points of matrix. From the L'Etoile du Congo Mine (Star of the Congo Mine), Lubumbashi, Katanga (Shaba), Dem. of Congo (Zaïre) Measures cm by cm by cm in total size. by elma