The white Burlington Chert is of very good quality (gloss) but doesn't show the reds of iron oxide that'd indicate heat treating--could be that it's the higher grade of Burlington called Crescent Quarry Chert. When you see flint that worked for high end pressure flaking you know the silicate level was a considerable degree above common "Chert". Here, you do see some lower grade inclusions on one side of the tip area, so this may have been a layer (lense) form of chert where the silicate level was higher toward on end--same thing is noticed on nodular flints where the cortex at the outer edges of the nodule drop from 'flint' to 'chert'--hornstone nodules are like that-- as a good example. Provenance: the piece ended up in a Bond County, Illinois, collection but has collection I.D. to make me think it came from the Bill Pesch Collection--tags indicate it was found in Shelby Co., Illinois. Length is an excellent 3&5/8" by 1&9/16", only 5/16" max thickness. Due to the degree of bevel sharpenening I'd identify the piece as a Harahey, yet readily agree some Adena Blades have similar shapes--just not the beveled edge. You decide what you want to call it (once you own the piece--it's your right)--it's real, period. Shipping is $9.00, checks or M.O.s are the only two ways to buy the piece as I do not use paypal-type services--Roy A.