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Quartz Inversion

Potters tend to be chemists as well as artists.  Some times this can be really interesting, like a John Britt glaze chemistry workshop.  Sometimes it can be really dull.  Sometimes we find it fascinating but the people we are talking to disagree, and they don't mind snoring around you to prove it.  But done right science can be fun and interesting.  That's where places like Tellus Science Museum in Cartersville, GA come into play.  Yes, it's a place where children go and have fun while they are accidentally learning but adults can also.
At the entrance to the mineral exhibit a volunteer showed us these two pieces of the same rock.  One was heated and the quartz changed color.  This is due to quartz inversion.  It's the same thing that happens to our pots in the kiln at about 1060 degrees Fahrenheit.  Can you tell which one was heated?

Other stuff:
How Temperature Changes Clay
Quartz Inversion - definition 
The Franklin Institute

Check out the gallery page - Future Relics Gallery


  1. I'm guessing the yellow one. Is that amethyst? I've been to that museum - it is super interesting. Yes, even for adults!


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