Found this antiquing. Was only marked "petrified rock"..It is black & charcoal gray in color with a vertical ribbed texture and some rounded ends. Measures 6.5" tall x 5.5" x 4" and weighs 8lbs 1.1 oz. Is it petrified wood ? Petrified cactus? Or something else? It's only letting me upload 1 photo. Took pics with phone and guess their too big. Will try to post more.