Peridot

Peridot is also known as Chrysolite, and is part of the Olivine group.
Chemical Composition: Magnesium Iron Silicate
Hardness: 6.5 - 7
Metaphysical Properties: Understanding, recognition, openness, acceptance. Provides a shield of protection. Good healer. Inspires happiness.
Corresponding Astrological signs: Virgo, Leo, Scorpio, Sagittarius
Chakras: Heart and Solar Plexus