You'll notice it's beautiful green color. Green is the corresponding color for balance and healing , associated with the thymus chakra, located at the heart center, near the physical heart. When used for healing, malachite will absorb negativity, and will have to be cleansed after each healing use. I have found green stones to be very cleansing for the blood, possibly because of it's association with the heart. Amethyst pictured at the top of the page is also one of my favorites and is very useful.
Amethyst is a type of quartz crystal.
In history, Egyptians used amulets of amethyst to induce dreams and visions. Amethyst, being purple, is associated with the Crown chakra which brings about your spiritual consciousness. It is able to control harmful behaviors, sharpen the mind, increase memory, alleviate emotional sensitivity, and strengthen the immune system. It calms an overly passionate nature and also absorbs negativity from the environment. Amethyst is versatile in that it can heal physical, emotional and mental illnesses.