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Blue Geode Quartz Close. Close View Of A Blue Quartz Geode Formation. Liked How The Crystal Structures Surrounded The Blue, Notice The Blue Veins As Well. Geode Greek γεïžî´î·ï‚ - Ge-ÅDä“S, `Earthlike` Are Geological Secondary Structures Which Occur In Certain Sedimentary And Volcanic Rocks. They Are Themselves Of Sedimentary Origin And Are Formed By Chemical Precipitation.