Definition of malladrite in English:

malladrite

noun

Mineralogy
  • A trigonal fluosilicate of sodium, Na₂SiF₆, occurring as pale rose-coloured crusts on lava.

Origin

1920s; earliest use found in Mineralogical Abstracts. From Italian malladrite from the name of Alessandro Malladra, Italian director of the Vesuvius Observatory + -ite.

Pronunciation

malladrite

/ˈmalədrʌɪt/