Description
Aventurine is a green to reddish-brown variety of the mineral quartz. This gemstone usually occurs in green and cut varieties. Aventurine has a hardness of 7 and is found in Russia, the Urals, and China, among other places. Like many other varieties of quartz (such as amethyst and rose quartz), aventurine is cut for jewelry use. The chemical composition of aventurine is SiO2 + KAl2(OH,F)2 / AlSi3O10 + Cr. The ancient Greeks sewed aventurine into warriors' clothing to maintain their courage, ambition, and optimism.
