[Axenolith]

Of course, a good volcano can do about a million times that in a few days...

[I-ambush]

Yes, but a volcano spews actual molten rock that cools to become different forms of igneous rock, not dissolved minerals in water that have to crystallize and add to previous deposits.

[I-ambush]

Yes, but a volcano spews actual molten rock that cools to become different forms of igneous rock, not dissolved minerals in water that have to crystallize and add to previous deposits. I’m not saying it didn’t happen, only that I’m surprised it could.