简要说明：vermiculite is a natural, non-toxic mineral, minerals expands subjected to high temperatures. It is

　　　　　　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.com　　www.zsqch.com　　Mrs luo 13930104417