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As already mentioned i also dont think its a moughton. But Henk visited the quarries there so probably there are variations in the colour, as far as i know Henk you also mentioned moughtons without...

Thats why i linked to Hatzichos Thread....even not knowing what these stones are......
I also thought on JNS / Japanese Stones that why i asked Rachim about the source....

@rachim: were did you get these from, from the bay ?
@Piet: not like moughton, a bit comparable because of the swirls......

you can check this thread:
Testing hones from Germany...