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The Rock Professor has provided you with a mineral
information card. Print on stock paper, and cut out to
enhance your rock and mineral products.
To print: with your cursor, highlight the entire card below,
right click and select print, then click on "selection"
and print.
| THE ROCK PROFESSOR |
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Septarian nodule in Bristol City Museum, Bristol, England.
Description credit: Kenneth Caruso, Joe's Rock Shop near Kanab, Utah.
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SEPTARIAN GEODE
(Septarian Nodule)
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Utah Septarians are found near Zion National Park in Southern Utah. They are a beautiful rock that started their formation approximately 150 million years ago when the gulf of Mexico reached what is now southern Utah. Volcanic eruptions killed the sea life and they became trapped in the sediment and formed mud balls.
The ocean receded and the balls were left to dry and crack.
The ocean returned depositing more shell life above them. As this decomposed, calcite from the shells was carried down into the cracks of the mud balls, and calcite crystals formed. A thin wall of calcite was transformed into aragonite dividing the bentonite clay (shale) exteriors from the calcite centers. Because of this dividing wall (septum in Latin) the geodes are called Septarians.
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Composition: Calcite (the yellow centers), Aragonite (the brown lines)
and the bentonite clay (outer grey rock). Occasionally the fossil or some of the fossils which started the formation of the rock is noticeable in the rock ♦
Localities: Utah, New Zealand, worldwide.
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Septarian Nodule Bear
$30.00
CRV 327
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Septarian Nodule Bear
$40.00
CRV 286
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Septarian Nodule Bear
$30.00
CRV 287
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Septarian Nodule Bear
$25.00
CRV 291
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Septarian Nodule Bear
$30.00
CRV 328
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Septarian Nodule Buffalo
$30.00
CRV 294
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Septarian Geode
Bookend,
$280.00
BE 638
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Septarian Geode,
$65.00
GEO 575
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Septarian Heart
$25.00
POL 288
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Septarian Geode Egg
$30.00
POL 946
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Septarian Geode,
$85.00
GEO 577
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Septarian Geode,
$175.00
GEO 580
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Septarian Geode Slab,
$25.00
GEO 673
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Septarian Geode,
$85.00
GEO 635
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Septarian Sphere
POL 849
$32.00
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Septarian Geode
Bookend,
$56.00
BE 637
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Septarian Geode
Bookend,
$240.00
BE 639
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Septarian Geode Slab,
$25.00
GEO 672
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Septarian Geode Slab,
$25.00
GEO 670
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Septarian Geode Slab,
$25.00
GEO 668
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Septarian Geode Slab,
$25.00
GEO 671
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Septarian Sphere
POL 848
$35.00
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Septarian Geode Egg
$30.00
POL 945
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