位于印度南部的Kerala和邻近的Tamil Nadu地区的宝石矿区,延伸范围达70×35平方公里,这里产有各种宝石,如金绿宝石(又叫猫眼石或猫眼)、红宝石、蓝宝石、祖母绿、黄玉、锆石和紫晶。原生矿化产生泛非期(Pan-African)混合伟晶岩带中,富集干麻粒岩相的变泥岩(Khondalites),它易遭风化和红土 The gem mining area of ​​Kerala in the south of India and the neighboring area of ​​Tamil Nadu extends over 70 x 35 km2 and is home to a variety of precious stones such as emerald (also known as cat’s eye or cat’s eye), rubies, sapphires, emeralds , Topaz, zircon and amethyst. Primary mineralization produces Khondalites enriched in dry granulite facies in the Pan-African mixed pegmatite zone, which is susceptible to weathering and laterite