Quartz filled concretion

Quartz filled concretion

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Quartz filled concretion. Section through a concretion showing veins of quartz (silicon dioxide, white lines) that has been deposited inside dilation cracks in what was probably originally a soft, water-containing mud-ball. The cracks were formed when the mud ball dried out to be transformed over time into a mudstone concretion. This specimen measures 110mm in diameter.

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Keywords: concretion, cracks, crystal, crystals, cut, cut out, cut-outs, cutout, cutouts, deposit, deposits, dilation crack, earth science, fossil, fossilized, fossillised, geographical, geography, geological, geology, inside, internal, mineral, mineralogy, minerals, mud-ball, mudstone, quartz, quartz-filled, rock, section, silica, silicon dioxide, stone, vein, veins, white background

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