On the moon there's a mini magnetic field that protects the surface from punishing solar radiation projected by the sun. Solar radiation hitting the lunar soil darkens the surface over time, but magnetospheres might be protecting such regions from this dimming effect. Black onyx also works like of shield absorbing and transforming negative energy into personal strength. It is known for its healing properties and manifesting positive strength during vulnerable times of stress, sorrow and grief.
Black Onyx on moon textured Sterling silver plate hangs at 16" on Sterling silver chain.