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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.
geological adjective. âº ârelating to âgeology, or to the âgeology of a âparticular âarea or âplace: a geological âsurvey/âmap the âcomplex geological âstructure of the âregion. geologically adverb uk us /-i/. adverb uk us /-i/.