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[james_bay_minerals]

Looking for help identifying this stone. Found on the riverbed of the Albany river on the James Bay coast in Ontario. Very hard (can’t scratch with a knife), translucent. Waxy lustre. In daylight appears to yellow and dark greenish grey. It was already tumbled quite a bit by the fast river, so it’s quite smooth. First photo is of its translucency (flashlight shining through it). My best guess is chalcedony.

[alfredo]

Chert or chalcedony (which are the same thing, chemically):

https://www.mindat.org/min-994.html

https://www.mindat.org/min-960.html

[james_bay_minerals]

Thank you!