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 ...

Mineral deposits can create markings that look like forests or mountains, and experts say each stone is distinctive. By Jill Newman When Tarun Adlakha displays a dendritic agate, with its finely ...

Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter. Agate, chalcedony formed from layers of quartz and often treacle-brown, has long been associated with 1970s ...

The storm gives this video a good setup, but the agate reveal is what gives it real click power. After the fossil hunting ...