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20848 - Beautiful Purple Natural Amethyst Crystals Cluster Minas Gerais District - Brazil Shark vertebrae In: Journal of Vertebrate Paleontology

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In: Journal of Vertebrate Paleontology 31(5)

Radioscutellum

Leriche 1942

shallow subtidal

ptychodon is quite distinct from those of other mosasaurids

20848 - Beautiful Purple Natural Amethyst Crystals Cluster Minas Gerais District - Brazil Shark vertebrae In: Journal of Vertebrate PaleontologyAmethyst is a purple variety of quartz (SiO2) and owes its violet color to irradiation, impurities of iron and in some cases other transition metals, and the presence of other trace elements, which result in complex crystal lattice substitutions. The hardness of the mineral is the same as quartz, thus making it suitable for use in jewelry.

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