紫晶 Amethyst
紫晶的化学成分是SiO2。硬度为7。紫晶是水晶家族中身价最高的一员，因为水晶晶体内含有Mn、Fe3+而呈现紫色。世界上高质量紫晶的主要产地有巴西、乌拉圭。
The chemical composition of Amethyst is SiO2, hardness is 7.Amethyst is the most valuable in the crystal family. The color is purple due to trace elements of Mn or iron (Fe3+).The main origin of high quality Amethyst are Brazil and Uruguay.
