Phosphorescent Golden Feather Tapered Calcite Crystal rainbow quartz The deep blue is when

The deep blue is when a 365nm long wave ultraviolet light is shined on the pendant

One end has multiple "teeth" terminations

Scalenohedral “dog tooth” calcite crystal with epidote and diopside

and vibrational stabilization

and the calcite fluoresces a magenta color under 254nm short wave UV

Phosphorescent Golden Feather Tapered Calcite Crystal rainbow quartz The deep blue is whenTapered golden calcite crystal. The calcite is fluorescent and phosphorescent with 365nm long wave ultraviolet light. The crystal has a fracture near the center so handle with caution. The crystal is stable, yet may have some weakness in that area. The price reflects this fracture. Size: 87 x 38 x 30 mm. 62 grams. From Jalgaon, Maharashtra, India