Onyx is a variety of Chalcedony, a member of the Quartz family with a hexagonal crystal system and a hardness of 7. Onyx is defined as a banded Chalcedony in which the lines of banding are parallel.
Onyx is a stone of inner strength. It enhances one's endurance and persistence, enabling one to carry even difficult and dreary tasks through to completion. It increases one's ability to maintain mental focus, allowing one to learn challenging new material and use well all that one has mastered. Ot energetically boosts the retention of memory and encourages attention to detail. Onyx is also a stone of physical strength. It assists one in containing one's energies rather than allowing them to dissipate. It helps one to gradually build up one's vitality. Onyx emanates the energy of self-mastery. It can help one to control, focus and direct the will,, and this brings about a considerable increase in one's personal power. It assists one in learning that the most important control is self-control. Onyx cools and condenses excessive energies. It calms nervousness, quells anxiety, soothes hot tempers and brings reason to passion."
Source: "The Pocket Book of Stones; Who They Are & What They Teach" - Robert Simmons
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