Strange Disc Is Modified Calcium Carbonate Concretion

Compare the disc from Stensö to these “fairy stone” calcium carbonate concretions from the Harricana River in the Abitibi-Témiscamingue admin region, Quebec, Canada. The Stensö piece has been sanded smooth and flat on one side. Locally these things are known as marlekor or mallrikor.

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Thanks to project advisor Lotta Feldt of the Östergötland County Museum for setting me on the right track.

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3 thoughts on “Strange Disc Is Modified Calcium Carbonate Concretion

  1. Cool, there are similar rocks that wash out of a bluff near my folks’ house, though much darker gray. They fracture in neat, thin layers sharp-edged layers much like the rocks used at Skara Brae, but a short while in the waves weathers them into the most beautiful shapes. I don’t remember seeing concentric rings like your find, but they often have holes bored right through them, looking for all the world like an artifact.

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  2. Mallrikar, I’ve seen them in Svensksundsviken not far from the site 🙂
    A question if you may help me, where can I find more about Herr Holmger and Sigrid? I’d like to read all there is, you see. Thank’s in advance

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