Hello Arya

There are many colleges in india for Msc in geology, geochemistry.

1. St Xavier's College Mumbai
2. Fergusson college
3. Chandigarh university
4. Hans raj college.
5. Presidency College Chennai.
6. University of Lucknow.
7. Mahata gandhi university Kerala.
8. MG science institute.

And you can join IITs also for Msc

https://university.careers360.com/articles/jam

Here's link for the admission process through JAM.

I hope it helps.