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1. mineralogy-the branch of geology that studies minerals: their structure and properties and the ways of distinguishing them. geology-a science that deals with the history of the earth as recorded in rocks.geode - (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals.ineralogy-the branch of geology that studies minerals: their structure and properties and the ways of distinguishing them. geology-a science that deals with the history of the earth as recorded in rocks. geode - (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals.
Minerals are defined as naturally occurring, inorganic, solids with a definite chemical composition and a regular, internal crystalline structure. The keys to this definition are the chemical composition and the crystalline structure. Different chemical compositions result in different minerals. A good example is the mineral plagioclase.