Malachite is one of the most important stones for protection from negative energies. It permeates the auric field with positive vibrations and strengthens the natural energetic "shell" which can screen out hostile forces, and it activates the "psychic radar" with which one feel the presence of danger. It even accentuates the sort of protection in which synchronicities seem to conspire to keep one safe. Malachite emanates the healthiest energy pattern for the heart. It assists one in maintaining emotional balance and it offers an advanced ability to see one's own emotional pitfalls.
The solar plexus chakra is stimulated by Malachite, enhancing once's will power. In the presence of Malachite, it is easier to refuse temptations. Malachite instills confidence and responsibility and is useful in making spiritual progress through right actions.
Malachite harmonizes with Tiger eye for physical energy, and protection and with Morganite for balancing the heart chakra. It also works easily with other copper based minerals such as Azurite, Turquoise, Shattuckite, Chrysocolla and Ajoite.
Source: The pocket book of stones by Robert Simmons.