The Peloncillo mining district in the Black Hills has a solid history of producing pumice and scoria as well as being a unique site for collecting fire agates. The Black Hills are at the northern end ...

Agate is a type of microcrystalline quartz that is characterised by its fine grain and vibrant colours. Agate is known for its banded appearance, with alternating layers of different colours and ...

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 ...