Pamukkale

Pictures of the famous travertines of Pamukkale.
These small ponds are natural mineral formations. They're only a couple inches deep, which made me wonder why they're so darned blue, as well as why the shade of blue is a distinctive turquoise.

I remember that last year in Canada we saw a number of glacier lakes that were turned turquoise by "stone flour" finely ground by glaciers, and I wonder if the mineral springs that bubble out here have a similar quality.