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Neugrund breccia is a type of rock consisting of gneissic breccia and amphibolite originating from the Neugrund crater.
Neugrund breccia formed during the cementation of meteor fragments.
Boulders of neugrund breccia can be found in north-western Estonia and on Osmussaar.
Biggest known Neugrund breccia formation is called Skarvan.
References
Neugrund breccia Wikipedia(Text) CC BY-SA