What is "zhemchuzhnikovite"

n. A mineral of organic origin with chemical formula NaMg(FeAl)C₂O₄.8H₂O, forming smoky green crystals with a vitreous lustre.

Zhemchuzhnikovite is a mineral of organic origin; formula NaMg(FeAl)CO.8HO. It forms smokey green crystals with a vitreous lustre and is found in Russian coal mines. It is named after Yury Zhemchuzhnikov (1885–1957), a Russian clay mineralogist.