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 ...

THIS exquisite image captures the astonishing internal structure of crazy lace agate, also known as Mexican agate. This section of the mineral is some 65 million years old. Agate is related to quartz ...

Agate countertops are a stunning and luxurious addition to any kitchen. The semi-precious stone is known for its ring-patterned beauty, and you can even add backlighting to counters to make their ...

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 ...