I will give you Encyclopedia Britannica's definition: Ferrite - A ceramic material with magnetic properties that are useful in many types of electronic devices. Ferrites are hard, brittle, iron-containing and generally gray or black and are polycrystalline - I.E. made up of a large number of small crystals. They are composed of iron oxide and one or more other material in a chemical combination. - More info. Even rust is considered ferrite! (I wouldn't try to sell rust). You well find ferrites in CRT yokes, transformers, chokes, coils and even just used as a weight. I put all of my ferrites (not rust) with light iron or shred buckets. I have never had any yard question it and have been paid from $.03 to $.10 a pound for it. Not going to get rich on ferrite selling but it all adds up to $$$$.
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