Sotheby's is putting some rare items up for auction, including what it calls the largest piece of Mars ever found on Earth.

A massive Martian meteorite is set to be auctioned at Sotheby's in New York. The meteorite, named NWA 16788, weighs 54 pounds ...

Rocks, minerals, and gemstones have fascinated people through the ages. They have been used as decoration, and have often been attributed special powers. This book, arranged in alphabetical format, ...