Explore / North America / Michigan
Michigan
Keweenaw Greenstone (Isle Royale), Copper Harbor beaches
Mineral locality Documented siteLegal to collect
What you could find
Reported finds from this ground.
Crystals and mineralsAlso reported: Chlorastrolite (greenstone) pebbles, the Michigan state gem, in shoreline gravel.
Photos via Wikimedia Commons: Stephanie Clifford from Arlington, VA, USA (CC BY 2.0).
.jpg){kind=link}
Why this spot
Precambrian basalt amygdules
Greenstone (chlorastrolite) is prized and protected within the national park.
Keep exploring nearby
More spots in this area.