... :0.3-1mm,1-2mm,1.5-2.5mm,1-3mm,2-4mm,3-8mm,4-8mmSilver:0. ... 3-1mm,1-2mm,2-4mm, ... well-ventilation,water preservation,poisonless,odorless, low hardnes 2,Chemical compositions: ItemSiO2MgOFe2O3Al2O3CaOK2OH2OPHContent %37-4211-233.5- ... 6.Animal Feedstuffs4.Quality Control: As samples confirmed by buyer, Or manufacture by certificate of quality, Or by CIQ (or SGS ...