clayey vs friable

clayey

adj
  • Resembling clay; claylike, clayish. 

  • Of the human body, as contrasted with the soul; bodily, human, mortal. 

  • Covered or dirtied with clay. 

  • Composed of clay or containing (much) clay; clayish. 

friable

adj
  • Easily broken into small fragments, crumbled, or reduced to powder. 

  • Likely to crumble and become airborne, thus becoming a health risk 

  • Smooth: that factors completely into small prime numbers. 

  • Loose and large-grained in consistency. 

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