Cracked quartz crystal point

Ocean blue or mint green. 

Crackle quartz is a crystalline quartz that has been intentionally fractured by people. They usually heat rock crystal or slightly translucent quartz to a high temperature, then suddenly quench it in cold water. The shock of sudden cooling causes a network of tiny fractures to propagate through the quartz.

Crackle quartz is easy to identify. Suspect it if you see tumbled stones with outrageous colors in the siclusitions - colors that are usually not found in natural stones. Manufacturers use dye in colors that will attract attention and stand apart from other stones.