Giant amethyst geodes formed within a steady groundwater flow and at unexpectedly low crystallization temperatures, new study ...

New research from the University of Göttingen reveals that amethyst geodes in Uruguay formed at low temperatures from ...

Amethyst is a violet variety of quartz that has been used as a gemstone for many centuries and is a key economic resource in ...

Amethyst is a violet variety of quartz which has been used as a gemstone for many centuries and is a key economic resource in ...

Amethyst geodes in Uruguay have been found in cooled lava flows, which date from the original breakup of the supercontinent Gondwana around 134 million years ago. However, their formation has ...

Researchers have revealed the geological processes behind the formation of amethyst and agate geodes in Northern Uruguay’s ...

Amethyst is a violet variety of quartz which has been used as a gemstone for many centuries and is a key economic resource in ...

Amethyst is a violet variety of quartz which has been used as a gemstone for many centuries and is a key economic resource in ...

A research team at the University of Göttingen, Germany, reported on its investigation into just exactly how amethyst forms ...