haematite :

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  • n  the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form

  • Steve Squyres in ABC Science Online
    We know that haematite usually is formed by the action of liquid water but there a lot of different ways of doing that,said Dr Steve Squyres, Mars Exploration Rover principal investigator at Cornell University in New York.

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