Black Onyx chunks are about 1 - 1.5".
Onyx is a stone of strength. It provides support and protection during difficult situations. Onyx provides a connection to the larger picture, or the sense of "oneness" or being "whole". This allows you to bring forward a big stance of personal power in any situation you face. It helps with learning lessons, and having potentially harmful situations as impacting your self-confidence in a positive way. It is also a wonderful stone used for bringing you to the present moment.