Rock Hunting the Beach at Rockport State Park

A rock hunt on Lake Huron. I didn't find many rocks, but there are other beautiful things to see on the beach.

Hand polishing the horn corals I found:    • Polishing Horn Coral by Hand  

The Petoskey stone (Hexagonaria percarinata) is an approximately 400 million old fossilized coral. It is the state stone of Michigan. Petoskey stones are calcite which is very soft, approximately 3 on the Mohs scale. Since they are so soft, they can be polished by hand. See this video for polishing instructions:    • How to Hand Polish a Petoskey Stone  

Puddingstones are a conglomerate stones comprised of red jasper and chert in a quartzite matrix. They are found in larger numbers on Drummond Island and St. Joseph Island in Canada but also across much of the lower peninsula of Michigan. They were called puddingstones by English settlers who thought they looked like an English pudding with berries.

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– KINGSLEY NORTH –
Kingsley North is a lapidary store in Michigan's U.P. They make a great cab machine and sell many other brands too. They have a huge selection rough rock, tumblers, grit, jewelry supplies etc. at good prices. I buy most of my coarse grit from here in 45 lb. bags. It's the best price I have found. If you buy using the following link, I make a small commission.
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This is the cabbing machine I use:
https://kingsleynorth.com/kingsley-no...

– THE ROCK SHED –
I buy a lot of lapidary supplies from The Rock Shed. I don't make money from your purchases there, but they have good prices and good service. This is where I buy my finer grits and polish.
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