User blog comment:Fintin/Poneglyph of Dressrosa/@comment-10860731-20140508131506/@comment-1595565-20140509144855

Well, it's just physics. Their indestructible nature means they're made of arguably the densest rock out there, ergo they're going to be insanely heavy beyond comparison. And Hawkinz the Riku family took over after the world government was formed which right away made their study illegal, so your idea of a post-VC poneglyph doesn't hold water.