Onyx (also: Black Chalcedon) is a gemstone.
Onyx actually means: the fingernail (Greek: onyx = nail). Black stone, hardly transparent, sometimes crossed by white sheets and strips.
Origin: Brazil, Madagascar, Mexico, Argentina.
The mystical significance of this gemstone is seen in its effect to lead harmful energies back to earth and thereby contribute to the restoration of stability. They say it could also protect against negative thoughts and contribute to inner balance and inspiration.
Since the Onyx unfolds its effect only very slowly, he should be taken for therapeutic purposes for a long time.