DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Detail of a polished slab of striped chert (also known as flint or flintstone) from a mine near Ilza in Lesser Poland. This stone is worked into all kind of ornaments and much fancied for its graciously curved concentric banding in soft brown reddish colouring. Actual size is 17 x 22 cm.
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