We can supply: -* snow white (99. 99% silica) * super semi quartz (99% ) * semi quartz (98% ) * potas felspar (11% k20, 2% na2o) =13% alkali ( + -1% ) * good second potas felspar (9% k20, 3% na2o) =12alkali ( + -1% ) * first soda felspar (10% na2o, 1% k2o) =11alkali ( + -. 5% ) * good second soda felspar (9% na2o, 1% k20) =10alkali ( + -. 5% ) ETC.