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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