ҮНЭТ ЭРДЭНИЙН ЧУЛУУ | Natural history museum of Mongolia
Emerald / Emerald /. Emeralds are called "smargados" and are derived from the ancient Greek word meaning green. The gemstone is beryllium (Be 3 Al 2 (SiO 3) 6) and has a green color due to certain compounds of chromium and vanadium oxide and has a hardness of 7.5-8 on the Mohs scale. It is very rare for emeralds not to crack, and almost all ...