Do you think that there would be pure ones around the same location?

It's doubtful. The mineral impurities in the crystals are most likely present in the surrounding area.

Even if you did find purer specimens, they still wouldn't be worth much. Quartz is too common to ever bring much money on it's own.

Gold sometimes occurs with Quartz, I don't think that's what I'm seeing.
I have both the Gypsum Rose and a Barite Rose(Darker color) both look like roses made of stone.
Here's some photos:
http://images.google.com/images?q=gy...ed=0CBIQsAQwAA