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MichaelS,
If I'm not mistaken, the description from the site says "Les Carrières de la Pierre Bleue Belge SA are among the leaders in quarrying, sawing and crafting blue stone in Europe. Our three...

Sebastian is right.
In an interesting conversation I had with Maurice in the coticule workshop, he told me that about half the income from the quarry comes from the useless stone...

The stone could be a Lorraine/ Rouge du Salm, but it looks more like a Belgian blue.
Also, the stone appears to be a bit thin. Could it be simply the backing from a coticule combo... with no...