expanded VermiculiteColor: silver and gold agricultural, constructionSize: 0.35-1mm,1-2mm,1.4-4mm,4-8mm,20-40mesh...With the process of removing sand and impurity, crashing, filtrating, Vermiculites become exfoliated, they can be divided into different sizes: 0-1mm, 1-2mm, 2-4mm, 1-3.5mm, 3-5mm,...