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Volcanic activity. Try http://gsa.confex.com/gsa/2001AM/finalprogram/abstract_21743.htm and http://www.springerlink.com/content/r86810n0618t030r/ and http://www.galleries.com/minerals/oxides/hematite/hematite.htm and http://www.mindat.org/min-1856.html and wiki's own: http://en.wikipedia.org/wiki/Hematite.

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17y ago

What else can I help you with?