Blue Quartz from Mexico. Blue quartz is simply macrocrystalline quartz that is blue. The term is used for - at least - three different types of quartz. Some would say that the term "blue quartz" is reserved for rock crystal that appears blue by Tyndall scattering. This, however, is the rarest form of blue quartz, and there is also a common denominator between all three forms: the color is caused by inclusions of other minerals, and not by built-in trace elements and/or lattice defects, like in amethyst, for example.See images above for random examples.This bag weighs 8 oz. and will contain an average of 5-7 nice sized pieces. Great refill for any beginner-novice tumblers.NOTE* This Bag DOES Not contain Grits, Findings, jewelry parts,or adhesives that may have been included with the original tumbler accessories. WARNING-Choking Hazard! Use Tumbling instructions from the tumbler manufacturer.WARNING-CHOKING HAZARD!