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A hollow, usually spheroidal rock with crystals lining the inside wall.
[French géode, from Latin geōdēs, a precious stone, from Greek, earthlike : gē, earth + -ōdēs, adj. suff.; see collodion.]
(Geological Science) a cavity, usually lined with crystals, within a rock mass or nodule
[C17: from Latin geōdēs a precious stone, from Greek: earthlike; see geo-, -ode1]
1. a hollow concretionary or nodular stone often lined with crystals.
2. the hollow or cavity of this.
A small, hollow, usually rounded rock lined on the inside with inward-pointing crystals. Geodes form when mineral-rich water entering a cavity in a rock undergoes a sudden change in pressure or temperature, causing crystals to form from the solution and line the cavity's walls.
A hollow nodule of rock lined inside with crystals.
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|Noun||1.||geode - (mineralogy) a hollow rock or nodule with the cavity usually lined with crystals|
mineralogy - the branch of geology that studies minerals: their structure and properties and the ways of distinguishing them
nodule - (mineralogy) a small rounded lump of mineral substance (usually harder than the surrounding rock or sediment)