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nodule - (mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment) mineralogy - the branch of geology that studies minerals: their structure and properties and the ways of distinguishing them.
When a geode is broken or cut open youâll see amethyst, quartz, agate or other minerals. The outside of a geode is bumpy and might resemble a head of cauliflower covered in dust! NODULES: A nodule is a geode that is completely filled. It looks like a geode on the outside but itâs not hollow.