Ok, it looks like some of you guys are tile connoisseurs.
Below is an explanation of what I know so far. I'm posting it here for those who are new to all this. (you can cover eyes and plug your ears now
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In general, tile used for floors is more dense and finer-grained than wall tile. That's why I used the term "floor tile" in the videos even though I'm technically using "porcelain tile" (we ordered an interior tile that absorbs very little water).
Ceramic or porcelain tile is practically identical and differs only in name when you are talking about interior tiles. Exterior tiles are made to be impervious to water, but you have to specify it. As for how it knaps, I need to try some but I'm willing to bet there's not much difference.
So far, all the floor tile I've knapped is basically the same. There are slight differences in texture but it's all brittle and not easy to run flakes on. There appears to be some tiles that approach the quality of glass, and I have to admit that I haven't knapped the good stuff that some of you guys seem to have found...
Anyways, I've received many questions about tile from all over the place. I'm talking to a guy in Russia right now. Who knows how tile is graded over there? But I won't confuse the issue by telling him to look for "porcelain".
So that's my take on it. Looks like this can become a very good topic for discussion and I welcome anyone who want to add their experiences (especially those who know more about this than I do).