412. Heat treated pebbles. 

In verses (11:82, 15:74, 26:173, 27:58, 51:34) of the Quran, it is been said that Allah decimated people who perpetrated evil by sending down a rain of heat-treated pebbles on them

The term heated pebbles should not be understood with a superficial meaning, because heated pebbles tend to cool down on reaching the surface of the earth.

But these verses declare a colossal loss on targets hit by these pebbles, signifying great heat in them on reaching the targets.

This points to great heat produced on explosion, implying compression of immense heat packed into the pebbles before them reaching their targets. Hence it is presumed these pebbles were packed with high energy, only to explode on contacting the targets. After detailing the evil being decimated in these verses of the Quran, it further asks people to contemplate on the kind of forerunner this offers for making weapons of mass destruction like atom bombs. 

Please refer to point No;355 for more details.