Adjective : impure water and air. ,an impure style of architecture. ,impure thoughts.    From Dictionary.com. 

This impureness can break the backbone of one's country if they are unheeded.    From Wordnik.com.  [WordPress.com News] Reference

(almost twice as heavy) a metal impureness corporate dSLR.    From Wordnik.com.  [www.awesomeblogs.com] Reference