New member also from Tn, USA

Hello, I am new to crystalline Zinc oxide macrocrystalline glazing in that I have tried a couple of times to get macrocrystals and have achieved adventurine tiny crystals.  I think my kiln wouldn't get hot enough for the cone 10 recipe.  I have bought a better electric kiln and a couple of books and hopefully will slowly get the thing hot enough and will have better results.  I also would love to get the Willemite crystals I have seen on some photos but can't seem to find a source for the willemite or erbium or whatever raw material will yield those crystals.  Any information I can find about whether reducing at low temps to keep the zinc but alter the colors will quickly damage the elements or not?  I have been throwing and handbuilding for years but not a whole lot.   Any suggestions to successfully make those matt crystalline glazes with the huge crystals would be very much appreciated.  I am happy to have found this site.  Thanks for being there.  Are you in the Netherlands?  I have been to Amsterdam and Delft and Rotterdam just touring around.