Hematite is an iron ore that is inexpensive, common and popular as a tumbled stone due to its mirror-like polish and density. It's chemical composition is iron oxide...similar to rust, and rough hematite usually appears reddish. If scratched, a polished or raw piece of hematite will produce a red streak.
Hematine (sometimes called Hemalyke) was once thought to be ground hematite that was mixed with resin for stability in carved stones and beads; however it is now known to be an entirely synthetic barium-strontium ferrite compound. When scratched, it can produce a red to brown colour. It is sometimes magnetised and sold as a pair of 'zappers' that are tossed into the air to make a loud buzzing noise.
More information on Hematite:[link]
Discussion on 'magnetic Hematite' = Hematine:[link][link]
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