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 ...

You might have heard of clear quartz-like crystals, Microcrystalline quartz. It is a special kind of quartz that forms in tiny crystals, so small that you usually need a microscope to see them. These ...