I picked up these slabs from a rock dealer for $20... I can tell that there is some chert, agate and obsidian but what type and are there other types of rock that I am over looking... For reference the tiles (linoleum marble
![laugh :laugh:](http://www.primitivearcher.com/smf/Smileys/default/laugh.gif)
) is 8"x4".
Also I think some of the rocks have a protective spell over them, since I have a great fear and anxiety of knapping some of the prettier ones!
![Roll Eyes ::)](http://www.primitivearcher.com/smf/Smileys/default/rolleyes.gif)