nefedyevite
/nɛˈfɛdjəvʌɪt/ /nəˈfɛdjəvʌɪt/Mineralogy
noun
A white or pinkish aluminosilicate of magnesium and calcium belonging to the montmorillonite group.
Origin
Late 19th century; earliest use found in Journal of the Chemical Society. From Russian nefed′evit from the name of V. V. Nefed′ev, 19th-cent. Russian mineralogist + -it.