The burden of latent tuberculosis infection (LTBI) in India's agate stone workers is nearly double the national average 1. Agate stones, which contain more than 60% free silica, are polished, chipped ...

Roula Khalaf, Editor of the FT, selects her favourite stories in this weekly newsletter. Ornamental hard stones such as malachite, turquoise and lapis lazuli have been part of the jewellery vocabulary ...

Known for their integrated colors and patterns, collectors are often amazed at agates that wind up on Upper Peninsula lakeshores. Known for its diversity and beauty, an agate stone is a form of quartz ...

Agates are formed from silica solutions filling gas bubbles in lava rocks, creating bands of color. The best time to find agates in Michigan is after a storm. Popular Michigan agate hunting locations ...