After 30 years working in the ceramic medium, I was determined to learn how to produce crystalline glazes.  They are labor intensive but the results are fascinating.

This is the above pot with a close up view of the crystals.  I used cobalt carbonate and manganese to get these crystals.

My first pots experimenting with crystalline glazes were small.  This one I'm holding.  I used copper carbonate for this glaze.

A close up of the above pot.....nice, delicate crystals.

My sundials are made for latitude 29 degrees, 45 minutes.  They keep great time!