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Aragonite and calcite are polymorphs—minerals sharing the same chemical formula but sporting different crystal arrangements
Tracing their ancestry to the primitive straight-shelled nautiloids of the Devonian period
amphibians
as shown by its sharp
Some varieties fluoresce blue or red under UV light
4.4" Polished Hexagonaria Coral Fossil Devonian Age 350 Million Yrs Old Morocco Koskinonodon Aragonite and calcite are polymorphs—mineralsLocation: Assa Zag Region, Morocco Weight: 1 Pound 5. 3 Ounces Dimensions: 4. 4 Inches Long, 3. 3 Inches Wide, 2. 9 Inches Thick The item pictured is the one you will receive. Devonian Age, 350 million years old Hexagonaria is a genus of colonial rugose corals that lived approximately 350 million years ago during the Devonian period. These fossils are recognized for their hexagonal corallites, each containing a central columella with radiating septae,
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