min·er·al·o·gy /ˌmɪnəˈrɑləʤi, ˈræ-/
Min·er·al·o·gy n.; pl. Mineralogies
1. The science which treats of minerals, and teaches how to describe, distinguish, and classify them.
2. A treatise or book on this science.
n : the branch of geology that studies minerals: their structure
and properties and the ways of distinguishing them