Septarian Geode

Size:

3.7" x 3.5" x 1.12"

94mm x 89mm x 29mm

Weight:

13.15 oz

373 grams

Location:

Utah

3.7" Septarian geode end slab from from southern Utah, about 15 miles from Zion National Park.  These Septarian crystals were formed sometime during the Cretaceous Period, between 144 to 65 million years ago.  During this period of time what is now known as the Gulf of Mexico extended into present day Utah, forming a vast interior sea.  Decomposing sea life had an attraction for the surrounding sediment, forming mud balls under the sea.  Tide and wave action rolled these balls around, creating sedimentary balls of a larger size.  As the ocean receded, the balls were left to dry and crack, allowing Calcite crystals to form within them.  A thin wall of Calcite transformed into Aragonite, dividing the shale exteriors from the Calcite crystals.  The name Septarian is derived from these dividing walls (septum in Latin.)  This slab was then cut and polished on one side from the end of the geode.  Piece weighs over 3/4 lb.  A great slab for display and study.

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