Onyx

Onyx is an astrological gemstone many types of which are used as astrological substitutes for primary gemstones. For example Green Onyx is an astrological substitute for Emerald. ONYX gemstone is a type of Chalcedony which has parallel banded layers. The colors of the bands may range from white to many other shades like black, blue, green, red, red-orange, orange, honey etc. The various varieties of Onyxes are used for Astrological as well as healing purposes.