Anahata is a Sanskrit word that literally translates into 'unstruck'.

When your Anahata is unstruck by life's heartaches, when it is pure and in love with the glory of the holy spirit, it is in it's highest vibration. The Anahata is known as the fourth chakra, or heart chakra. Your Anahata is the central point in the chakra system. It is a bridge between the spiritual and material worlds. It is here that we learn acceptance of both spirit and matter, and where true peace is born. The Anahata radiates an emerald green color. At the center of your Anahata is a spiraling vortex of light and energy that shapes your physical heart, thymus, skin, and hands.  Excerpt from Chakra Healing for Transcendent Health.  All of the crystals in this section support optimal energetic flow within your Anahata.