Hey, I was recently up in Harvey N.B. and stopped at a river to look for the rhyolite I heard was abundant there.  After a little looking I noticed discolored portions of the sandstone cliffs that were white and yellow and looked kind of like a flow of something.  I went over to look at them and found that embedded in the crumbly, chalky yellow/white stuff were chunks of stone.  After breaking one I found it to be a mahogany colored rhyolite.  Some chunks are very tough but one I found was really fine and am yet to try working it.  There were two exposures like this along the river and the river itself was full of it.  Though I didn't find the exposure my little brother also found a grey form of it further up the stream and one piece had a layer of amethyst on one face of it, the first time we have found amethyst here in N.B.  There was one more exposure that was quite large, perhaps 12ft. along the bank, it was chalk white and had the little crystals in it like rhyolite, it was all broken up and look like a big debitage pile in front of it that a giant had made, just big flakes 6-12in. long where it had gotten busted up somehow, I didn't take any though due to the fact that it wasn't really workable, it was very soft unlike the other rhyolites and not really good for anything.
   Am I right in thinking that what I found are pieces that were shot out when a volcano erupted and landed in the sandstone formation creating the white/yellow stuff around them, or are these actual rhyolite dykes from a lava flow?  I will get pics of the exposures when I am there again, it may not be for quite a while though as it is a good 3 hour drive from here just to get there and another 3 hours back.
   Any advice on working with this or how I may find more of it would be great as I have only worked ballast flint, glass and quartz previously.














This one looks pretty good!




Not sure what this piece is, I found it there and it looked so nice I took it as well, I think it is a fine quartzite but haven't busted it yet.

 I'm pretty sure it is rhyolite as that area is supposed to have a huge amount of it, it also looks almost identical to Kineo rhyolite from Maine only kineo is generally green and finer grained, but they both have the little diamond like crystals all through it.  I think the last one is quartz too, but probably quartzite.  What I usually find around here is either white quartz that is a bugger to work or a very coarse almost shattered looking quartzite that is really more or less unusable, not like the quartzite I have seen others working, this seems to be neither and a new type for me.
   Caveman on Paleoplanet thought it looked like it was chelcedony of some sort.

The second rock is definately quartzite and a pretty coarse grade, also.  If you want to knap it, look for a finer granular size.  FWIW, I have found points made of the same grade of quartzite, it was all they had.  And, they had to import that stuff from the river about 19 miles away.

Eheh that mess reminds me of the house where I lived when I was at the university, there was flint, clay, pieces of copper and tin, everything 
Greetings,
Mauro.

lol if the same future archaelogist also uncovers fragments of the internet that mention zombie apocalypse - it'll make perfect sense

Makes you wonder what examples of unrelated coincidence our historians have come across  

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well that makes everything MUCH clearer - not !