RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY RHYS LEWIS & MINH TAN PHAM, AHS, DECD, UNISA / SCIENCE PHOTO LIBRARY
Polished onyx. Onyx is a banded variety of chalcedony, a form of silica (SiO2). The bands come in many different colours. Commonly, specimens of onyx contain bands of black or white or both, as in this specimen.
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