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Description:Lumaschelle or muschelmarmor (German) is a sedimentary rock containing opalescent shells and shell or ammonite fragments showing brilliant, mainly green to red reflections. This stiriking and beautiful polished slab of Triassic limestone is from the historic Bleiberg District of Austia and the composition is called shell hash by geologists, as it consists almost entirely of fragments of mollucs and gastropods. This is a serious old-timer from the collection of Herb Obodda # 1481 and comes with an extremely faded German label, that must date to the early to middle 19th Century or earlier.