Definition of millisite in English:

millisite

noun

Mineralogy
  • A light grey or white hydrated basic phosphate of sodium, potassium, calcium, and aluminium, (Na,K)CaAl₆(PO₄)₄(OH)₉·3H₂O, crystallizing in the tetragonal system and occurring as finely fibrous crusts and spherules.

Origin

1930s. From the name of F. T. Millis, of Lehi, Utah + -ite.

Pronunciation

millisite

/ˈmɪlɪsʌɪt/