I'm sorry, but it won't go to Minnesota.
Eddie, I was a marble maker long before I ever made a bow.
It's a craft that is passed down in my area from generation to generation among Rolley Hole marble players.
You first pick a piece of good solid flint at least 1" thick and start grinding it into as round of ball as you can. Once you get it as round as you can. You place it in a shallow depression chipped into a Carborundum stone and VERY carefully ease it over against a rubber wheel mounted on a bench grinder. This will start the marble to spin inside the depression and eventually become smooth. If they didn't have any grinders. Some of the old timers would "peck" them out with a file, jack up their car, put it in gear and spin them against the tire
Getting one perfectly round takes some practice, but I've made a few hundred that mic'd out perfect. The rock has to have a perfect consistency for that to happen.
You can make a marble from most any rock. But for a good "playing" marble, it takes a different kind of "flint" than we use for knapping. I don't know exactly what kind of rock it is. James Parker called it "man rock"
Agate, Jasper and some of the more translucent flints would make a really pretty marble.
Here's a picture of a few I had laying around. The two big ones, I made for knife handles. The three in the middle are my playing marbles and the two on the right are from rock a couple of old timers gave me years ago.
Maybe sometime if there's enough enterest, I'll do a "make-a-long"
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