I've seen magnesite with next to no "matrix" that will surely pass for turquoise in the future, even if it's debut at shows and in stores is represented correctly. Since it's value is very minimal compared to quality turquoise, it's a red flag to turquoise lovers.

But...having not bought any magnesite, I haven't broken any beads - does the dye really penetrate all the way through, even big chunks?