Clear quartz
This white crystal is considered a “master healer.” It's said to amplify energy by absorbing, storing, releasing, and regulating it. It's also said to aid concentration and memory. Physically, clear crystals are claimed to help stimulate the immune system and balance out your entire body.
Clear Quartz Crystal is a power stone that harmonizes and balances. ... A powerfully protective stone, it also purifies on all levels; spiritual, emotional, mental, and physical. Because it directs and amplifies energy it is exceptionally beneficial for manifesting, meditation, and channelling.