Stone is a natural, non-toxic mineral, minerals expands subjected to high temperatures.It is a relatively rare mineral, belonging to Portland.Its crystal structure is a single helical system, from the shape it looks like mica.Vermiculite is a certain amount of granite produced during hydration.It is generally produced in conjunction with asbestos.As the vermiculite ion exchange capacity, it has a great effect on soil nutrition. www.caisha-china.comwww.zsqch.com Mrs luo 13930104417
