California State Parks, which manages more than 340 miles of California’s coastline, is asking the public not to collect any ...

Yooperlites can be found as loose pebbles and cobbles along many Lake Superior beaches and even in some inland gravel pits.

We knew he would be an excellent guide on our agate hunting adventure. We met up with him at a secluded beach on Lake Superior right outside Duluth and started sifting through the rocky shore. For ...

The geochemistry of agate and chalcedony in volcanic rocks represents an intricate record of silica precipitation and crystallisation processes occurring under variable thermal and chemical ...

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 ...

People come to Oregon from all over the world to hunt for thundereggs, the seemingly unremarkable egg-shaped rocks that hide beautiful patterns of agate, opal, jasper and other gemstones.

Michigan, Minnesota and Wisconsin all feature ancient rocks known as gneisses — metamorphic rocks banded with various minerals — but an analysis determined that the gneiss in northern Michigan ...

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 ...