Black Ammonite Pair 12" x 12" x 2" Calcite is a mineral that is

is a mineral that is often found in association with quartz

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primarily composed of chalcedony with microgranular quartz

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Black Ammonite Pair 12" x 12" x 2" Calcite is a mineral that isBeautiful pair of natural Black Ammonite fossils with pyrite embedded within the spiral of each ammonite. Individually each ammonite fossil measures 12" x 12" x 2". Ammonites are extinct relatives of sea creatures such as the modern Nautilus from Palau. Ammonites lived during the Jurassic and Cretaceous periods. Together, these represent a time interval of about 140 million years. The Black coloration is due to changes to the rock formation within the