A Library Quartz is unique in that it has one or more flat pieces attached to the side of the base crystal. These pieces assist one in accessing ancient knowledge, whether you would perceive the information as from the Akashic Record or contained within the subconscious.
When you are using a pendulum you are attempting to connect with answers to your questions. Those answers are then tapped into. This particular Quartz piece acts in the same way. Your answers will come from the past, present, or future. So if you are studying anything, this is a tool to help you reach the desired goal. I have seen several in the Crystal Life store in the past, perhaps they are waiting for you.