Michigan Rocks
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Tumbling a Speckled Green Rock
Michigan's State Gemstone from Rough to Polished
Sam shows us everything from how to extract greenstones from basalt to polishing them to a shine.
Gambiri Agate Acid Soak
11 Hour Superior Beach Agate Hunt
Last year's hunt that Sam referred to is here: https://www.facebook.com/share/v/1H9HzBmiNR/
05/21/2026
I’d like to introduce you to our newest grandson, Peter Frederic. He’s named after Saint Peter the apostle and Venerable Bishop Frederic Baraga. I think that’s a very good name, considering his father David is a geologist from Michigan. Peter means “rock” and Bishop Baraga has a town in the U.P. named after him. He also founded St. Bernard Catholic Church in Alpena where Peter’s mother Allison is from. Big siblings Joe and Maria love their new brother.
Do Polka Dotted Rocks Tumble Well?
Trying Out a New Core Drill for Making Stone Spheres
I just bought a Vevor core drill to speed up the preform making process for making stone spheres. I want to thank the members of the Sphere Making Facebook group for their help. https://www.facebook.com/share/g/1Bhd6Kpgom/
Black and Red Rock Tumble—This one was a bit surprising.
How I Tumble Gambiri Agate Halves
I cut some beautiful Gambiri agates in half, and now it's time to tumble them. If you'd like to get some of your own Gambiri Agates, you can get them here: https://hplapidary.com/products/gambiri-agate?_pos=1&_sid=22ccee49a&_ss=r&ref=ROBERTABRAM (affiliate link)
Use the promo code MICHIGANROCKS for 10% off.
Crosses and Turtles and Bears—Oh my!
Just a quick look at some rocks that came out of the tumbler recently. These are rocks that came from a variety of sources, plus a few shapes that I cut out.
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Alpena, MI
