Included in this listing are two pieces of petrified wood.  The polished slice,with a beautiful pattern in shades of light orange and rust, is 5 1/2" at the longest point, 3 3/4" wide, and 3/8" thick.  The other piece is 6" long, approximately 2" wide, and 1 1/4" at the thickest point.  I purchased them at auction and do not know where they originated.