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Geode

- Noun

A nodule of stone, containing a cavity, lined with crystals or mineral matter.

- Noun

The cavity in such a nodule.


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  • Geode

    Geode

    Geodes (derived from the Greek word "γεώδης" meaning "Earth like") are geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely circular rocks, in which masses of mineral matter (which may include crystals) are secluded. The crystals are formed by the filling of vesicles in volcanic and sub-volcanic rocks by minerals deposited from hydrothermal fluids; or by the dissolution of syn-genetic concretions and partial filling by the same, or other minerals precipitated from water, groundwater or hydrothermal fluids.

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