Blue John

Calcium fluorite with purple and pale yellow produces Blue John which can be used to make fragile dishes which can be bonded with resins or magic to make them easier to work and use.

• Period: O
  • Copper Hydroxyls
  • Hardness: 4
• Group: Group VIIA?

See also Matter, Gems, F and Copper Hydroxyls.

— Scotus - 05 Jan 2002