The subrotate is defined by "mixed" layers, i. H. the layers (or formations) alternate with gray, red or volcanic deposits, and originated about 280 million years ago.
The "moonstones" have their name from the Verkieselungen, so silica columns in the quartzite rock.
Another known rock of this type is the "marble stone" in the Taunus.
December 7, 2019
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