I've had these little flakes of Burlington chert lying around so I did a little knapping. The one at top left is my rendition of a Cahokia shark tooth effigy point. The rest are just oddball points that came out of the rock on their own. I wasn't trying to make any certain type of points, I just let the rock decide. All of this rock is untreated except the bottom two. I did the heat treatment in a campfire when I found the chert. I buried it about 2" deep in some beach sand and built a healthy fire over top. The next morning I dug out the chert and surprisingly there was no pot lidding or cracked chert. It came out pretty nice, color and workability.
These points are all Colorado material from around Grand Junction. The toughest one to knap is the middle piece above the penny. Its untreated chalcedony. The two in the bottom row are common opal from Opal hill which is west of GJ. This stuff knaps like glass and is beautiful rock. Wish I had more. Again, I just let the rock decide what shape it would turn into.
Heres a picture of a nodule of Burlington as found on the shore of Truman Lake, Missouri. It has a thick cortex, or coating, which is kind of chalky.
Heres an end shot of the nodule showing the chert interior. This is some fine knapping material. You can plainly see the cortex in this photo.
Heres a super nice specimen of native copper crystals from the Upper Peninsula of Michigan. It was found at an old copper mine near Houghton. The American Indians used native copper for thousands of years to make tools. They traded a lot of it as can be seen in the contents of mounds and burials far away from the source.
Heres a group of stone tools from North Africa. I bought them at the Tucson gem and mineral show. The dealer said these were from western Algeria. The top three are uniface blades. I really like the little points, especially the one on the left. I was a bit surprised to see these listed in Oversreets Arrowhead price guide. They're in the back of the book. These are going pretty cheap right now. I paid a dollar each. After the supply starts to dwindle they'll likely go way up in price. Get em while ya can if ya make it to Tucson in February!
Thanks for looking and enjoy!