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impurities and crystal size
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Agate and Onyx are both varieties of layered chalcedony that differ only in the form of the bands
Sphere made of the mineral calcite
Orthoceras fossils are believed to be an excellent healing stone
Orthoceras Fossil Oval 2-3" Baryte impurities and crystal sizeCut, shaped and polished Orthoceras fossils. Cut in to an oval shape. Measures about 2" 3". Orthoceras, is a genus of extinct nautiloid cephalopod. Its name is derived from the words straight horn, referring to its long, conical shell. These creatures roamed the seas during the Ordovician Period (485 million 443 million years ago). They are the ancient ancestors of ammonites and squid that can be found in sizes ranging from a centimeter to over 14
