Heat Treated Keokuk Clunkers & Flakes, High Grade Flint, Flintknapping, Lapidary flintknapping These are heat treated Novaculite

These are heat treated Novaculite slabs and  are 5/16 to 3/8" thick

It is possible for some pieces to have marks or holes

75 inches and are a full 13oz thickness

Obsidian was widely used by ancient people and was almost exclusively used by some South American tribes

Heat Treated Keokuk Clunkers & Flakes, High Grade Flint, Flintknapping, Lapidary flintknapping These are heat treated NovaculiteThese boxes are filled with approximate 20 lbs of kiln heated Keokuk goodness. The spalls are what I would consider clunkers but make no mistake its all nice material that works just as nice as my othere boxes and can yield lots of points 2" 4 inches.