52.2 MB (2.4 MB compressed)
5079 x 3592 pixels
42.9 x 30.5 cm ⏐ 16.9 x 12.0 in (300dpi)
DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Phosphorite in its host rock. Phosphorite (dark red spots) is a sedimentary rock that contains high levels (at least 20 per cent) of phosphate-bearing minerals occurring in nodular or compact masses. The phosphates originate from a variety of sources such as bird droppings and animal faeces. Here, the phosphorite occurs as round pellets (red), which are most probably fossilised animal faeces (coprolites), in a calcium rich matrix (white). This specimen was found in northern Brazil, and measures 12cm wide.
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