Hum i'm not a specialist... more a collector.
What could it be if it is not a coti ?
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I understand... i'll have to learn how to lap a stone :)
That is big. Though in the coticule museum I've seen one that was 3 cm thick, 12 cm wide and about 60 cm long or something like that. :D
PDSO stands for "pierre du sud-ouest." It's a name given to a light ochre or mud-colored stone that looks and acts similar to a coticule. As I understand it, it's real name is not known, and the only reason it is called "pierre du sud-ouest" is because many of these stones have be purchased from eBay sellers in that area of France.
If that is what you have, and I agree that the stone needs to be cleaned up first for a better chance of identification, it would be worthwhile for us to know what such a stone is actually called in France.
Well they are still out there...difficult to find though. This mine , most likely a La VeinetteAttachment 328672
Wow, it's a big one !!!
Here is my last find. This one is for sure a coti, but needs to be cleaned too...
https://i.ibb.co/fr6tB89/IMG-20210430-142040.jpg
https://i.ibb.co/b1JK8pP/IMG-20210430-142106.jpg
lexilogos anglais
That’s a very large coti.