I read all the rules before posting and I hope this Is an allowed kind of post. I'm trying to do some logical worldbuilding and I need to answer this question. Importantly, I already know that limestone Is important as a building material, so I'm looking for a 'special' or unnatural (even magical) property of limestone that would make it so. Consider that this limestone would be found only in one location in the whole world. Thanks in advance to everyone :)