Willemite
7-14-06
Macro crystalline glazes contains large crystals of zinc orthosilicate. The naturally occurring mineral form of zinc silicate is called Willemite - a fluorescent mineral.
The Willemite Site......http://students.juniata.edu/waterle04/
http://www.mindat.org/min-4292.html
http://en.wikipedia.org/wiki/Willemite
http://mineral.galleries.com/minerals/silicate/willemit/willemit.htm