Hi Mr Luigi Minozzi;
Our company produce and sell raw material for tile, glaze, refractory, cement and glass companies.
We do several examination on the nepheline syenite and application of nepheline syenite in formulation of glaze and tile.
If you interested on nepheline syenite, you can visite mine and processing steps, also we can send for you sample of nepheline syenite.
please send for me contact detail.
Best Regards