The garnet group is a wide a varyied group. The name derives from the latin meaning grain due to the rounded crystals . Garnet is normally known as red but many other colours also fall under this heading some being found in only a few depsoits in the world such as tsavorite named by Tiffany and co after the Kenyan national park where found. It is also found in tanzania and has also been found in madagascar. Most have the same mohls hardness of 6.5-7.5 but the refractive indexs are different for each type of gem.