... silicates which have the appearance of mica, and is found in various parts of the world. When processed for horticultural ... growth. · Horticultural vermiculite is permanent, clean, odorless, non-toxic and sterile. It will not deteriorate, turn moldy or rot. The ... requires them.· Vermiculite is very light in weight, easy to handle and easily mixes with soil, peat, composted pine bark, fertilizers, ...