Carnelian

Carnelian (also spelled cornelian) is a brownish-red mineral semi-precious gemstone. Carnelian is a silica mineral chalcedony colored by impurities of iron oxide. The color can vary greatly, ranging from pale orange to an intense almost-black coloration.
Composition: Carnelian is a form of Agate, which is Silcon Dioxide.
Metaphysical Properties: Perception, precision. Increases physical energy. Protection against the emotions of fear and anger. 
Corresponding Chakras: Use at 1st through 4th Chakras.
Corresponding Astrological Signs: Taurus, Cancer, Leo