The name aventurine derives from the Italian "a ventura" meaning "by chance". Aventurine is a variety of translucent quartz with abundant small plate- or flake-shaped inclusions Light entering the quartz strikes these inclusions and reflects from them. This produces a sparkly appearance known as "aventurescence. 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!