Vermiculite is a natural mineral that expands with the application of heat. The expansion process is called exfoliation and it is routinely accomplished in purpose-designed commercial furnaces. Vermiculite is formed by weathering or hydrothermal alteration of biotite or phlogopite.
Reptile eggs will supprise you. A few of my mates found a clutch of skink eggs under a brick at school (they thought the eggs were frog eggs -_-) Anyway, they went and dug a hole and buried them. I found out about 5 minutes late and I went to investigate. I done what I thought was right to do and put the eggs in a zip lock bag and took them home. Not knowing which way was the original way up btw.
Anyways, long story short, I incubated them and every single one hatched. Little garden skinks
I would have never thought that they would hatch.