Hi-Crush Partners announced yesterday they’ve gotten Chesapeake Energy to sign a new, long-term frac sand supply agreement to buy Northern White frac sand to support Chessy’s completions program in the Marcellus (in Pennsylvania) and Powder River Basin (in Wyoming). Northern White sand comes from mines in Wisconsin, Illinois and Minnesota. But sand is sand, right? Why schlep sand all the way from Wisconsin (via rail) to Pennsylvania? Because sand is *not* just sand. Northern White has special properties that make it superior for fracking.