He knew the rock at Castlewood to be the same, 34-million-year-old rock defining Castle Rock and other buttes and mesas along Interstate 25 between Denver and Colorado Springs.

Growing interest in rocks is fueling small businesses in communities across the state. Even small Oregon towns often boast one or more shops catering to enthusiasts.

Every year, Tucson becomes a global stage for Earth’s most breathtaking treasures at the Tucson Gem and Mineral Show. But beyond the dazzling opals and ancient fossils lies something deeper ...

TUCSON, ARIZ. (KGUN) — The Gem, Mineral and Fossil Showcase wraps up its second week with some “rock” music out at the Pima County Fairgrounds for the Gem and Jam Music Festival. The ...

Visitors look over items for sale during the 47th annual Chicagoland Gems and Minerals Association show at the Kane County Fairgrounds in St. Charles over the weekend. (David Sharos / For The ...