Fire pops and impact fractures

[chong2]

here a couple examples i have found, first pics are of a good example with small fire pops and you can see the color change due to high heat, and the rest are of impact fractures, the tan san jose'ish one is a good example of a impact fracture , i could just see this guy sticking in the bone of some big game and loosing a small chip, right on the tip, hurled from a atlatl.... ouch!
Feel free to post what all you guys have