Elementals

This is just a random story I made up one night while playing with marbles (Don't ask) I was screwing around and i found seven marbles, all of them a color that resembled an element I used,
Fire was a clear marble with a red stripe in it
Water was the same, but with a dark blue stripe.
Ice was also clear, but with a very light blue stripe.
Air was intresting, it didn't have a stripe, it was pure glass
Nature had a large lime green stripe in it,
Energy was clear with a Yellow stripe
Death was a solid black marble i found. i may have found it in a park, but it was still all black.