... ,1-3mm 4,Origin:Hebei,China expanded Vermiculite for garden/agriculture,2-4mm Feature Products Expanded vermiculite Golden: 200mesh,325mesh, ... -resistant,well-ventilation,water preservation,poisonless,odorless, low hardnes 2,Chemical compositions: ItemSiO2MgOFe2O3Al2O3CaOK2OH2OPHContent %37-4211-233.5-189-171 ... us to negotiate and confirm ./ R0304 expanded Vermiculite for garden/agriculture,2-4mm