DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Tiger's eye. Polarised light micrograph of a thin section of Tiger's eye, a quartz-like (silicate) mineral valued as a semi-precious stone. It has a soft, golden, silky sheen, which is due to the fibres of the asbestos-like mineral crocidolite that form it.
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