The Collaborative International Dictionary of English v.0.48:

Mineralogy \Min`er*al"o*gy\, n.; pl. Mineralogies. [Mineral +
   -logy: cf. F. min['e]ralogie.]
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   1. The science which treats of minerals, and teaches how to
      describe, distinguish, and classify them.
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   2. A treatise or book on this science.
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