geode


ge·ode

noun \ˈjē-ˌōd\

Definition of GEODE

1
:  a nodule of stone having a cavity lined with crystals or mineral matter
2
:  the cavity in a geode

Origin of GEODE

Latin geodes, a gem, from Greek geōdēs earthlike, from earth
First Known Use: circa 1732

geode

noun    (Concise Encyclopedia)

Hollow mineral body found in limestones and some shales, commonly a slightly flattened globe 1–12 in. (2.5–30 cm) in diameter and containing a chalcedony layer surrounding an inner lining of crystals. The hollow interior often is nearly filled with inward-projecting crystals, new layers growing on top of old. The crystals are often of quartz but sometimes of other minerals.

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