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Old 17th October 2017, 03:29 PM   #15
AHorsa
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Join Date: May 2014
Location: Rhineland
Posts: 92
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Thanks for the replies! Will do research in those directions.

Sadly no provenance. Got it from an estate.
I am quite sure it is some gypsum like stone. For volcanic tuff it appears to be not porous enough...

Cheerio
Andreas
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