Chad G.

looks like a vitro to me

This one wasn't in a kiln, Machine made. The hot glass was in a tank before it came out and was sheared off dropped and hit the rollers. Yes they are called annealing fractures, probably from cooling to fast ?? Not sure, maybe someone else will chime in ?? There are a few different reasons they get these fractures. Fried marbles is a term used to describe marbles that were heated after production then plopped in cold water fracturing the entire marble clear through, they were packaged and sold as "Fried marbles" many people did it at home, it used to be a thing I guess ?? https://www.instructables.com/Fried-Marbles/

Is it lighter than glass, it may be Polymer

Fractures, probably happened during production ??

Machine made IMO

Could be a drizzle, ya I'm grabbing 😁

No CAC for me either, IDK what it is

X2

Not a slag, all slags have transparent bases, no matter the color. The op is opaque

Another Josephs coat, I had almost 400 of them at one time cut it down to all of them, @ or over an inch. This one was 27/32nds. My favorite type of German hand mades.

Boy do I wish !!

No, just a nice Alley

Not Transitional IMO

X3

Any rotation causes it to be a cork which it has, so not a patch IMO, though it has characteristics of one the rotation rules it out as a patch.

X2

Good guess Brother, you may be right ? We know what it isn't, (pelt, akro, alley, mk, vitro, heaton, etc...) that narrows it down quite a bit.

Base looks clear to me to, the red follows the white swirls, I still can't seem to lock down an I.D. perhaps @cheese will know ??

X2

Agree W William,, far right is a Peltier Rainbo

Yes