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Buy Onyx – the Black Chalcedony
Onyx is a variety of chalcedony, meaning fine-crystalline silicon dioxide. With a Mohs hardness of 6.5 to 7 and no cleavage, it is one of the most robust stones in our range and suitable for everyday use.
A note on the trade: A large portion of the black onyx in circulation is dyed agate. Naturally uniform deep black onyx is rare. In astrological gemstone healing, onyx is assigned to Capricorn.