Tourmaline crystallization (Boron Metasomatism) in granite at Champaner, Gujarat
This granite is named as Unclassified granite and gneiss by GSI (Geological Survey of India) workers. Within a few meters we can see gneiss. At places there is tourmaline crystallization due to Boron Metasomatism. This is due to metasomatic changes after the formation of Granite. It comes under Allochemical Metamorphism. Here a solution rich in boron introducedes in granite which forms boron silicate known as tourmaline.