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The physical properties of green sardonyx include a hardness of 6
and persisted for hundreds of millions of years throughout the Paleozoic Era
Champsosaurus lived during the late Mesozoic and early Cenozoic eras
Dominated by orthopyroxene—an iron and magnesium-rich mineral—the meteorite displays the characteristic dark coloration and substantial density typical of its classification
where ammonites were abundant
10.1" Alethopteris Fern Plant Leaf Fossil Carboniferous Age Llewellyn FM ST Clair, PA Clam The physical properties of greenLocation: Llewellyn Formation, St Clair, Pennsylvania Weight: 2 Pounds 10. 4 Ounces Dimensions: 10. 1 Inches Long, 5. 2 Inches Wide, 0. 6 Inches Thick (Plate) Comes with a Certificate of Authenticity. Comes with a Free Stand. The item pictured is the one you will receive. Pennsylvanian Age, 300 million years old. Alethopteris Sp Fern Fossil Long before modern forests existed, dense swamp ecosystems covered much of the Earth during the Pennsylvanian
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