According to the composition of garnet, usually divided into aluminum and calcium series two series. High variant of the Ti (TiO2 16.44% ~ 4.60) in the calcium iron garnet. Artificial yttrium aluminum garnet Y3Al2[AlO4]3 as laser material is the result of the replacement of calcium and silicon by yttrium and aluminum. The crystal form of garnet crystal is obvious, and the shape of the polymer is four, 38, twelve or two. Garnet color varies with the composition, glass luster, its color is beautiful and transparent person is precious stones. Such as pyrope, garnet, the latter is andradite, containing trace Cr3+ and green color, China called garnet gem "Purple teeth Ukraine" (or garnet). Garnet Moss hardness 7.5 ~ 6.5, the proportion of table.