1534 - Big Spalling with 3-1/2 lb Sledge Hammer on TN Creek Chert 

Flintknapping. Knapping rocks. Making stone tools. Arrowhead. Lithic reduction.
Large Rectangular Abrader:
flintknappings...
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Patreon:
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Front View of My Knapping Style:
• 589 - Flintknapping An...
Abo Technique (Natural Materials Only) My Horizontal Punch Style of Knapping:
• 407 - Abo Flintknappin...
Swiping or Scraping with hard Hammer:
• Flintknapping Hardhamm...
WHAT IS HIGH GRADE STONE?
Anything you can run a 1/2" or more flake with a pressure flaker.
HEAT TREATING:
Heat treat a few FLAKES of everything you got except HIGH GRADE Raw Stone, Obsidian, Dacite, Basalt, Hornstone, Sonora, Fort Payne, or Rhyolite. Start with flakes and spalls less than 1" thick for 200°F for 24 hours to dry it out. Then raise the temp to 275°F and hold for 4 hours. Let cool down for 12 hours. Chip and compare. If no difference, put back I at 200°F for 1/2 hour, then raise to 275 for 1/2 hour, then raise to 325 for 4 hours.
Let cool down for 12 hours. Chip and compare. If no difference, put back in at 200°F for 1/2 hour, then raise to 275 for 1/2 hour, then raise to 325 for 1/2 hour, the raise to 375 for 4 hours.
Repeat with temp going up 50°F until you reach 600°F or nice chippable stone. Whichever comes first. If no good result, or things blow up, let us know.