The Pale Grass Blue (Pseudozizeeria maha) is a tiny butterfly found in India.

The male upperside is silvery blue whereas the female brownish black upperside.

The eggs are laid on the host plants and the larvae hatch to feed on them.

Citations:

This tiny butterfly is often un-noticed by most of us. But our interest in the subject made us to spot this blue in our school garden. The reference obtained from Wikipedia.