Rock Garden, Inc

RGI, established in 1994, specializes in Tumbled Copper Nuggets and Glacier Art Copper from Upper Michigan plus a variety of Upper Michigan Mineral specimens.

PHONE or TEXT: 906-280-1697

RGI 2026 EVENT SCHEDULE  

Jan 1 thru Feb 10  Quartzsite, AZ    Desert Gardens International Rock and Gem Show We are located in the same spot, F-12, right in the middle of the show.  Open 9am to 5pm daily. As always, we will have a great selection of Glacier Art Copper and of course lots of Nice Nuggets!  We will be open about a week before the show officially starts so stop by early to see the best variety of items before they are gone!

Glacier Art is a Registered Trademark #803297111

Glacier Art Copper refers to a piece of native copper that was carried from its original location by the glaciers that formed the Great Lakes. The host rock was ground up by the action of these glaciers but the native copper remained as an artistic nugget. Native copper as "Float" can be found with metal detectors miles from where it started.  The masses are oxidized purple and green (Cuprite and Malachite) after sitting in the soil since the glacier receded approximately 10,000 years ago. The patina and shape are a form of the Glacier's Artwork. The high spots of these pieces are then polished to show the inner beauty of the copper.

Upper Michigan Copper Nuggets

Upper Michigan's Copper Country has the purest native copper in the world. Metal detectors are used to locate the copper chunks in the poor rock piles that were overlooked by the miners from many years ago. The chunks are then tumbled in a custom tumbler to remove the host rock (basalt) revealing the unique copper nugget shapes. RGI's copper nuggets are ALL NATURAL with no acid treatment and have not been melted - only tumbled and rinsed with water. These are really Nice Nuggets!


We have a 100% satisfaction guarantee on everything we sell.