Hardness- 7.5 - 8
Crystal Structure- hexagonal
Emeralds, said to bring good forture and ward off bad spirits are mainly made of beryl, the same as aquamarine. Be^3Al^2SiO^6, is the chemical make up of the stone.
Emerald is very valuable and because most emeralds have flaws, a flawless emerald is worth much more than most can afford.
