Does this mean the marble fried ?

[Spn]

So I have this vitro but it has hairline cracks from the inside of the marble now this only had two on it. I do have others with a lot of hairline cracks.are these classes a fissure marbles?

[Spn]

This is a different one but worse.no cracks from the outside of the marble.

[Chad G.]

26 minutes ago, Spn said:

This is a different one but worse.no cracks from the outside of the marble.

Fractures, probably happened during production ??

[Spn]

Ok thank you 

[Carowill]

My understanding is that these are annealing fractures that happen if the cooling of the marble isn't just right after coming out of the kiln.

[Chad G.]

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/

 

[Spn]

Thank you for the info.

[Chad G.]