Keywords: Blue John Veins in the Blue John Cavern.jpg Blue John or Derbyshire Spar; a form of fluorite Veins in the Blue John Cavern Transferred from http //en wikipedia org en wikipedia<br/> Original text Mfloryan talk 2006-10-13 Mfloryan talk Original uploader was Mfloryan at http //en wikipedia org en wikipedia PD-AUTHOR Marcin Floryan Original upload log page en wikipedia Blue_John_Veins_in_the_Blue_John_Cavern jpg 2006-10-13 16 00 Mfloryan 800×531× 397279 bytes <nowiki></nowiki> Blue John Cavern Derbyshire Blue John - mineral |