Definition of perrierite in English:

perrierite

Pronunciation /ˈpɛrɪərʌɪt/

noun

Mineralogy
  • A monoclinic silicate of lanthanides, titanium, iron, and other elements, (Ca,Ce,Th)₄ (Mg,Fe2+)₂ (Ti,Fe3+)₃ Si₄ O₂₂, occurring as black or reddish brown prismatic crystals.

Origin

1950s; earliest use found in Chemical Abstracts. From Italian perrierite from the name of Carlo Perrier, Italian mineralogist + -ite.