Toll-Free 888-331-7625 or 307-754-4681 | Shopping Cart | About Us - Company Info | Contact Us Page | Home Page Rough: Black chalcedony onyx $6.00 The black chalcedony onyx from Africa is in rough form but probably will be saw blocked for smaller sizes from one pound and up since most of the large rough will weigh 15 pounds and up.  Use the black chalcedony onyx for carving, cabs, and as a base for opals, etc. Cabs of black chalcedony onyx are great for classic black jewelry, a  favorite color of many. Catalog #430.   Related Items Here are some products that may also be of interest to you: • Black chalcedony, onyx slabs