I've had this happen on a couple of indie products, mosty lip balms and one pressed shadow from a no-name company. It's definitely crystals but like someone else said, a 6-week shelf life is unacceptable.
I've never been super into NM and their "look," I guess, but I've always gotten my orders within 3 weeks (the last thing I ordered was their Mystic Mattes). I wonder if they're one of those companies- the type where they make sure half is sent within TAT to make them look better?
My biggest issue with them so far was that Holiday release last year with the square lids- half of the product was spilled. It was super disappointing, and more of it has spilled out because the lids will NOT stay tight.