Rust and Umber Petrified Wood Square DishOne of the most vibrant color combinations we've found in a smaller petrified wood dish. Rich rust, umber, tan, oranges, and gray swirl together in natural patterns formed over millions of years. A delicate seam of micro druzy adds a subtle sparkle to this collectible piece. About Petrified Wood Colors & Formation Petrified wood forms when ancient trees are buried under sediment and mineral rich water replaces the organic material cell by cell. The