Googling friendship compatibility between Libra and Gemini I found:
A partnership between a Gemini and a Libra features a lot of combined energy and consciousness of each other’s strengths and weaknesses. Gemini and Libra are almost identical to each other in many respects. Both have same intellectual skills, and both possess a dual form of character. Libra are good at maintaining a good balance in life. Libra are much better at beginning new schemes than at carrying them through. Gemini could help Libra at choosing things as well as finishing things once started. Gemini and Libra generally have a fruitful relationship.
The planetary combination makes Gemini and Libra a great team, and they move forward successfully.
The most interesting aspect of a companionship between a Gemini and a Libra is their similarity of character, their ability to work well together, and their combined mental strength. They could introduce each other to new things and aspects of life. The comparable intellectual prowess and common goals of them make them an outstanding pair.