Blue John Characteristic Physical Properties
3-3.25 Typical: 3.18
Blue John will sometimes have triangular negative crystals, mineral inclusions, color zoning, healing cracks 2-phase and 3-phase inclusions and liquid inclusions. Bluish violet to purple bands in a reddish to colorless background. Might have pits or scratches. Look to see if the stone has been impregnated with resin.
Perfect, in four directions