Dims: 1.38x1.32x0.77" (3.51x3.35x1.95cm)
Wt: 0.50oz (14.2g)
Kertsh Peninsula, Ukrtsh, Black Sea
This is a fossil shell where the original material has been replaced with rhodochrosite. It is also possible that the shell becamed lined with rhodochrosite before it disolved away - some such explanation is needed to explain the flat area filled with rhodochrosite at the bottom of the specimen. Part of the outer surface of the specimen holds dozens of tiny black metallic dull to glassy nodules, which I believe to be manganese, but of course they could be something else. I purchased this specimen from a Russian miner - the location given is my best guess at his handwriting.