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Septarian calcite geode polished 8x3.5\" 8+#,s Utah free priority shipping su1 For Sale
![Septarian calcite geode polished 8x3.5\](img-large/g/AOoAAOSwW8hlb2a9/s-l1600/Septarian-calcite-geode-polished-8x3-5-8-s-Utah-fr.jpg "Septarian calcite geode polished 8x3.5\")
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Septarian calcite geode polished 8x3.5\" 8+#,s Utah free priority shipping su1:
$37.49
All naturalSeptarian calcite geode cut and polished from Utah,USA. The geode or nodule has been cut in half and polished to show off the Septarian calcite interior which formsfrom decomposing sea shells filling voids in mudconcretions asCalcite crystal.The name Septarian is derivedfrom the latin word septum or partition, and refers to the cracks/separations in this kind of rock.The process that created these cracks remains a mystery. A number of mechanisms, like the dehydration of clay-rich, gel-rich, or organic-rich cores; shrinkage of the concretion\'s center; expansion of gases produced by the decay of organic matter; brittle fracturing or shrinkage of the concretion interior by either earthquakes or compaction; and others, have been proposed for the formation of cracks.However in the case of these geodes/nodules its clear that calcite filled these cracks and left us beautifulrocks.
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