Red Aventurine "flats" cut pieces collection box with 1.5-1.8 kilos of natural red Aventurine from India.

Aventurine, also known as aventurien, is a variety of quartz that has colors ranging from green to reddish brown. This gemstone usually appears in a green, cut form. With a hardness of 7, aventurine is found in places such as the Urals in Russia and in China. Like many other quartz varieties, such as amethyst and rose quartz, aventurine is cut for jewelry use. The chemical formula of aventurine is SiO2 + KAl2(OH,F)2 / AlSi3O10 + Cr. In ancient times, the Greeks sewed aventurine into the clothing of warriors to strengthen their courage, ambition and optimism.