I'm sure that you're right about the differant amounts of trace minerals...Redmonds does not list the elements exhaustively as does the Himilayan, they only say "numerous other trace minerals..."
I'm thinking that using the himilayan crystals, though, is best for sole. The crystals are formed over millenia & when we consume sole made from the crystals, we are also taking in that energy.
About the pink color, in sole made from the crystals, I will find "floaters" -reddish-brownish...I think Invincible is right on that, that it's iron. If I find anything on that I will let you know..."Pink" is not in the index... :)