This is for a pre-owned Petrified Wood Fossil.  I found this in my river rock.  Appears to be outer bark texture.  The lower portion displays distinct vertical ridges and grooved texturing characteristic of prehistoric tree bark.  The top exhibits a bubbly, light colored or botryoidal formation where mineral crystals pooled and grew inside or over the fossilized wood structure.  Measures approximately two and one fourth inches tall.  Comes from a smoke free home.  Once payment has been received I will ship out the same day or the next morning.  Thanks for looking.