User blog comment:Kogath/Monster Hunter: World Discussion/@comment-6050823-20180106170809/@comment-32313091-20180107132437

Doesn't really seem that odd to me. MH4U's Volcano had an area full of crystals as well, and volcanoes in general can be a source of various kinds of crystal-like substances (such as Obsidian, but lots of others as well). Though ofcourse in MHWorld it seems like they're way bigger than they would be in our world.