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Its nothing special and i dont see what these informations bring any advantage....

Its known that a lot of vintage and also actual quarries deliver products of a general use (roofing slate, garden...

yes sure...here is the link:
Index website Henk en Ge Bos

Download part 4 and switch to Lorriane Rouge / Rouge Du Salm


Identifiers are:
- a very reddish coloration of the slurry, tending...

Actually under a geological term a Lorraine Rouge or Rouge Du Salm is a different type then a BBW....

The identifiers are known and can be found in Henk Bos Grinding and Honing Part 4 on Belgian...