I saw it said that lightening can hit stone and explode it if it contains moisture.
The guidestones were granite. I don't think granite absorbs moisture.
I saw it said that lightening can hit stone and explode it if it contains moisture.
Granite is pretty much an insulator, but it can have veins of higher conductivity material. The Swiss bury a lot of their military supplies in their mountains. A group came to visit us at the lab to milk us for possible information for a problem that they had. Apparently the lightning current travels along such veins in the insulating rock of the mountains. There is no easy way (or no way) to map these veins so that you can choose an optimum route for your tunnels and storage rooms. There is no advantage to having such veins near your tunnels or explosive storage areas.
That said, in my opinion rather than a nearly direct act of God, manually placed explosives on the monument are likely the most believable explanation for the observed phenomena.