Natural Malachite, Raw Green Malachite, Wards Off Danger, Natural Gemstone Rough Minerals Metaphysical. Malachite crystal pieces, natural rough malachite, rare gemstone. This listing is for one (1) natural malachite crystal slab. Malachite crystals are essential to help energy healing, chakra balancing, and drawing out negative energy from the body. These green gemstones are helpful to women looking to regulate their menstrual cycle and lessen pain from cramps.