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August 20, 2008
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  Home > Gemstones > Varieties >

Natural Ammonite Pyrite

Natural Aquamarine Ammonites are the common name given to the Ammonoidea, an extinct order of cephalopods. These relatives of today's squid, octopi, and Nautilus were abundant, intelligent, active, and predatory molluscs that lived in shallow (100 meters or less) marine environments throughout the world. Competing with fish for food, they fed on fishes, molluscs (including other cephalopods) and any other prey they could catch.

Most ammonites had large jaws capable of crushing shell, as well as grasping arms and excellent vision. Ammonites first appeared in the Late Silurian seas about 415 million years ago, and then abruptly disappeared from the world's oceans 65 million years ago, at the end of the Cretaceous Period.

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About Ammonite Pyrite gemstones

Color Various
Refractive Index 1.708-1.773
Chemical Composition Calcium carbonate
Hardness 5.5-6.5
Crystal Group Not applicable
Ocurrence Ammonites are found in Paleozoic and Mesozoic marine rocks worldwide.
Ammonite Pyrite Ammonite Pyrite
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