Mineralogy \Min`er*al"o*gy\, n.; pl. {Mineralogies}. [Mineral + -logy: cf. F. min['e]ralogie.] [1913 Webster] 1. The science which treats of minerals, and teaches how to describe, distinguish, and classify them. [1913 Webster] 2. A treatise or book on this science. [1913 Webster] [1913 Webster]