well, maybe if you come across another chunk of that stuff, you might do some tests on it. I must say, I've often been happily surprized to find that the inside of a rock is way different from the outside. In my area, I'm surrounded by water/beach environments where all the rocks have oxidised- just like your flint- being so different as it ages. (imagin how increadible that game ball looked when it was new and gleeming). Breaking rock- to me- helps understand whether a rock was imported or local. Some of the material around here doesn't look at all like the points I find, but when I break rock, I find that it is, in fact, local. Light peach-colored rock breaks open to be red or dark brown. Pale grey rock breaks open to black interiors. I would not know that unless I did a little 'damage'. I would have (wrongly) assumed they were trading for or importing rock from some dinstance. Keep in mind too, that no one would have ever found a geod if they didn't break some rocks!
Cheers mate!
Yak
Yeppers, it is a bit more fine grained.
