22/04/2021 · It's kind of cool." But that's not the whole story. In fact, it's only the tail end of the process. Related: Video—400Foot Chalk Cliff Climbing Competition "You can look it up on Wikipedia, I guess," laughs chalkfather Gill, when I ask if he knows where magnesium carbonate comes from. But there is no Wikipedia page. In fact, there is little info about where the industry gets ...