Onyx is valuable in difficult or confusing times/days in our lives because it repels negative energy. It raises one’s resistance and persistence, enabling one to carry tasks to completion. Onyx enhances the retention of memory and promotes attention to detail.
Hematite clearly has a very strong grounding energy; you can feel that just by holding the stone in your hand. It also has a cooling and calming effect, as well as helps develop concentration and focus. Overall, hematite brings a quality of energy that is powerful, strong and grounding. It works with one's mind by calming it and clearing the unnecessary clutter.