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.