Although commonly confused for plant fossils, dendrites are actually a natural fractal crystal formation. They form when water rich in manganese and iron flows along fractures between layers of limestone and other rock types, depositing dendritic crystals. The result is tree like structures ranging in color from black to orange. Beautifully displayed as large slabs or small tiles. All minerals and stones vary in size and shape. You will receive a high quality specimen of the selected item but not the exact one pictured. All minerals, gems, stones and fossils are guaranteed to be top quality; sourced from ethical vendors around the world.