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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.
Defining a mineral. A mineral is a naturally occurring inorganic solid, with a definite chemical composition, and an ordered atomic arrangement. This may seem a bit of a mouthful, but if you break it down it becomes simpler.