blue john

noun

a blue or purple fibrous variety of fluorspar occurring only in Derbyshire: used for vases, etc

Nearby words

  1. blue island,
  2. blue jasmine,
  3. blue jay,
  4. blue jeans,
  5. blue jet,
  6. blue law,
  7. blue laws,
  8. blue lias,
  9. blue line,
  10. blue lips

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012