Septarian nodule

Septarian nodule

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Septarian nodule. This is a round mineral deposit of claystone (grey) filled with cracks formed when the claystone dried up. These cracks fill with other minerals, often calcite, a form of calcium carbonate. The variety of patterns that can form are often prized for their beauty. This specimen, from the Appenine mountains, Italy, measures 350 millimetres in diameter.

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Keywords: appenine mountians, ball, claystone, concretion, cracked, cracks, dried, europe, european, geological, geology, italy, mineral, rock, round, septaria, septarian nodule, septarium, stone

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