Seraphinite is a particular form of clinochlore, and a member of the chlorite group. It acquired its unique name because of it's chatoyancy effect, causing a feather-like appearance. It has a hardness of 2-4 on the Mohs Scale, and typically ranges from dark-green to gray in color.
Metaphysical: It is believed that placing Seraphinite on the Third Eye Chakra makes it easier to engage the Third Eye Chakra's self-healing. It is also said to be one of the stones used for making angelic connections, and for opening the Crown and Higher Crown Chakras.