An infertile egg that is way past its hatch date will also explode, it's as the insides start to rot, the gases expand the egg until the egg explodes, also lack of calcium causes a thin egg shell. One of mine keeps breaking eggs on actual laying because egg shells are too thin.
A rough egg is a calcified egg, the Tortoise has retained the egg for too long, usually because there's no attractive nesting site.
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