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geode |
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Roughly spherical, hollow or
partially hollow accumulation of mineral matter from
a few centimeters to nearly 0.5 m in diameter. Outer layer of
chalcedony lined with
crystals that project toward hollow center. Crystals,
often perfectly formed, usually quartz although
calcite and
dolomite
also found and - more rarely - other minerals. Geodes most commonly found in
limestone and more rarely in
shale.
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