One spring day last year, Mark Longman was hiking around Castlewood Canyon State Park with questions that mounted with every boulder and rock wall he passed. A career geologist and longtime Denver ...

In Marathon County, the cooling process was slow, so the minerals that make up moonstone separated from other materials around it to form the distinct blueish rock. "Moonstone has been prized as a gem ...

Rockhounding is a popular activity, but digging through the rules of where you can go and what you can keep isn't much fun.

A.K. Miles of Salem spent summers as a little girl traveling the Pacific Northwest with her grandparents, collecting rocks and helping her great-grandfather cut and polish them in his lapidary shop.

One spring day last year, Mark Longman was hiking around Castlewood Canyon State Park with questions that mounted with every boulder and rock wall he passed. A career geologist and longtime Denver ...