Deriving its name from the Italian term "a ventura," which means "by chance", Aventurine is a translucent to opaque variety of Quartz. Tiny inclusions gives it a gentle sparkle. Blue Aventurine contains inclusions of Dumortierite. Did you know that Quartz is the most abundant single mineral on earth? It makes up about 12% of the earth's crust! Some of the earliest primitive stone axes fashioned 2.5 million years ago in the Omo valley in Ethiopia, were made of quartz varieties such as quartzite.