glittering vs illuminant

glittering

noun

  • The appearance of something that glitters. 

adj

  • Brightly sparkling. 

  • Valuable, desirable. 

illuminant

noun

  • Something that illuminates. 

adj

  • That illuminates. 

How often have the words glittering and illuminant occurred in a corpus of books? (source: Google Ngram Viewer )