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You're breaking my heart, internet!

"Almandite garnet crystals are found in a quartzose mica schist about 1.6 km west of Chelsea in Delaware County. Near the surface the schist is badly weathered...

Tell me where and they will be before I head home.

It appears that stones very much similar to coticules were actually mined at Ratisbon. Here's the pages of the book pertaining to these stones (and Belgian coticules, they are lumped together).
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Isn't Ratisbon in SE Germany though? There may be old Coticules from Recht labeled as German hones, but I'd think it must be a seperate issue from these stones as they are stated as being mined in...

Here's an excerpt from "The Non-Metallic Minerals: Their Occurrence and Uses"
By George Merrill



According to Renard,1 the celebrated Belgian razor hone quarried at
Lierreux, Sart,...