Black Onyx
Black onyx is the trade name for dyed black chalcedony (in its natural state black onyx, a variety of chalcedony, is banded with white). A nice durable stone, with good resistance to chipping, which polishes well. Hardness: 7 (Mohs).
Black onyx is the trade name for dyed black chalcedony (in its natural state black onyx, a variety of chalcedony, is banded with white). A nice durable stone, with good resistance to chipping, which polishes well. Hardness: 7 (Mohs).
