Geode
Geode :
Roughly spherical, hollow or partially hollow accumulation of mineral matter. A few centimeters to nearly 0.5 m in diameter. Outer layer of chalcedony lined with crystals that project toward the hollow center. Crystals, often perfectly formed, usually quartz although calcite and dolomite and - more rarely - other minerals. Most commonly occur in limestone, and less often in shale
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