In a recent article in Miner Deposita, researchers presented a comprehensive study of the amethyst and agate geodes in the Los Catalanes Gemmological District of Northern Uruguay. This region is ...

In January 2021, a photograph started circulating on social media that supposedly showed two halves of a rock resembling the character Cookie Monster from the children's show "Sesame Street": While it ...

The geochemistry of agate and chalcedony in volcanic rocks represents an intricate record of silica precipitation and crystallisation processes occurring under variable thermal and chemical conditions ...

On the west side of the Pryor Mountains, a few miles shy of the Wyoming line, a canyon's limestone walls tower above the desert rangeland. Twisted junipers, but little else, rise from the desolate ...

When it is viewed with light shining from behind, this polished slice of agate reveals an internal pattern with a likeness of HM Queen Elizabeth II. The specimen is currently on display at the Museum ...