The "Crystals Kit: Use the Power of the Rainbow for Healing at Home" by Jennie Harding is a 2022 publication that includes 6 crystals and a 64-page crystal guidebook. This kit is designed for those interested in mindfulness, meditation, and energy healing practices like Qigong, Reiki, and Polarity. The book focuses on the healing properties of crystals and how they can be utilized for personal well-being and spiritual growth, making it a valuable resource for individuals seeking to incorporate crystal therapy into their daily routines.