This is a slab of rare Rhexoxylon (a seed fern) petrified wood from near Gokwe, Zimbabwe. The petrified wood from this area is Upper Triassic or approximately 250 million years old. The slab is 12x10" and one side has been polished to a mirror finish allowing the unique interior of this fossilized "wood" be visible. It comes with an acrylic display stand.
There is a repaired crack running through the middle of the slab.