A stone called "Aerolita"

This stone was full of "dots", inside and outside. A man living in Caldera told us there are only a handful of this kind of stones in the world. These ones (three) and two others in Australia. No one knows from where they are coming and locals usually don't go close. There's a rumor that says that the stone can make you feel sick. The stone was magnificent, but belive it or not... The next day I got so sick!