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Text File  |  1992-09-02  |  189b  |  6 lines
  1. Iron manganese tungstate. (Fe,Mn)Wo4, an ore
  2. mineral of tungsten. It is dark grey with a
  3. submetallic surface lustre, and often occurs
  4. in hydrothermal veins in association with
  5. ores of tin.
  6.