clearing quartz crystals

[Guest guest]

Hi all, I have a question. I have a clear quartz cluster that has

changed in color. When I first bought it a couple of years ago, the

very bottom of the cluster,(flat side where it would sit)was very

cloudy. Now over the past year or so I notice that the cloudyness has

moved up the crystal more. Is there a way that I can return the

cluster to the color it was when I bought it? If not would this

change in the crystal affect the usefullness of it as far as healing

goes?

Thanks for your responces. SpiritSeeker