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Originally Posted by Demeter
I would say its more likely the crap that's in the water these days that makes it different. Chlorine, fluoride, chemicals to keep the pipes free of build-up...
The 'white' in ice cubes is minerals. Thus, ice made from tap water would vary from place to place as much as the water does.
Pure distilled water makes clear ice. I use filtered water for mine.
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Close but no cigar.
The white in ice is disolved gasses coming out of solution as the temperature falls.
The ammount of gasses that will be disolved into the water in the first place is a function of hardness (i.e. mineral content), so the white is not the ACTUAL minerals, but is seen more in mineral rich water.
As has been said already, many of the minerals in water are denatured or driven out by boiling (this is called "temporary hardness") leaving only a smaller portion of the total ("permanent hardness"), also boiling drives off some of the disolved gasses. This is why freshly boiled water makes clearer cubes.