Anahata, The forth Chakra, The Heart Chakra.
As you may have probably guessed its located in the heart region of the body, its colour is green (representing growth and renewed healthy relationships) and its element is air (representing freedom/expansion) with the Thymus as its gland. This Chakra is responsible for love, compassion, passion and trust.
When this Chakra is in balance you will be more friendly, more caring and understanding to others but when out of balance it can cause moodiness, loneliness, anxiety, jealousy and anger.