Going out on a limb, but identifying this chert was a challenge--when you see colorful iron oxides, though, that narrows the possibilities. In this case, my corner of the Hoosier state has two main Chalcedony materials: Holland Flint and Derby Flint. Personally, I think this Pinetree is a heat treated flint (a campfire stone) that was accidentally heated, gotten so hot the iron oxides were suddenly visable--RED.To the best of my knowledge this may be the only piece of "Derby" I've ever seen with heat altering--usually it'd shatter before 'tempering', that's why it wasn't known as a heat treated material. The Pinetree is from an old Warrick County, Indiana, collection, 2&1/8 by 1&1/16"--1/4" max thickness. There were so many sharpenings of the blade that the barbs are simply gone--and one basal corner has a tiny chip off the end of the pointed corner; ancient damage from Early Archaic usage. The basal edge is nicely ground. There is an inclusion nearer the tip, and how the knapper kept sharpening the blade without snapping the tip is a mystery--delicate work, he was good at it. Shipping is $6.00, checks or M.O.s are welcomed. Sorry, I do not use paypal--Roy A..