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An artificially created magnetic material (this contains NO natural Hematite) widely sold as 'magnetic hematite' or simply 'hematite'. Please note that the name 'hematite' is quite misleading, as this is NOT a natural stone.
Investigation of one item offered for sale as 'magnetic hematite' showed it was composed of a ceramic barium-strontium ferrite magnet: (Ba,Sr)Fe12O19 that has the magnetoplumbite structure. The average grain size of the ceramic is 5-10 microns, and the porosity is 10-15%. In addition, the magnetic field strength of this material is much larger than that of any magnetite specimen.
Other items were identified as magnetoplumbite-type SrFe12O19.
(Ref: Andrew Locock, http://www.mindat.org/mesg-55-94798.html)
[See also http://en.wikipedia.org/wiki/Ferrite_%28magnet%29]