what makes quartz a good crystal to make as a diode?
at the diamond mine in arkansas i found a small cloudy smooth and round stone that i later found out was quartz. they also say uncut diamonds are similar in appearance
Yes, it can. Normally round and smooth quartz grains are found in beach environments where the wave action has had a lot of time to tumble the stones together. So in that sense, they have been processed.
Yes, if it's found in a river bed. It would have been subject to erosion by water (i.e. processed). Yes, a round piece of quartz means it has been processed in some way.
