Quick Specs
- Material: Black onyx
- Quantity: 1 lb lot of tumbled stones
- Stone Size: 10-30mm (about 0.4 to 1.2 inches)
- Finish: Tumbled and polished
- Color: Black to smoky dark grey, with some pale veins and brown patches
- Grade: Sold as A quality
Black Onyx: Banded Chalcedony in Glossy Black
Onyx is a variety of chalcedony, the fine-grained form of quartz, with straight, parallel bands of alternating color running through it. Chalcedony is cryptocrystalline, meaning its quartz crystals are too small to see without strong magnification. That banding made it a favorite for cameos, where the bands make the carved image contrast with its background, and the Roman Gemma Augustea is carved in two-layered onyx. Onyx has long been carved into beads, cabochons and ornaments as well. Black onyx is the all-dark form. Dyeing is a standard treatment for it: grey or banded chalcedony is soaked in a sugar solution and then treated with acid, which turns the sugar to carbon inside the stone and leaves a deep, stable black. Black and white banded onyx is usually left undyed. Onyx takes a high polish, and tumbling is a natural fit for it, since the process rounds the rough pieces and brings up the gloss.
Each stone here runs 10 to 30mm, from about the size of a chickpea to nearly an inch and a quarter across, and the mix of sizes gives the pound some variety. The shapes are rounded pebbles with a few flatter ovals and angular pieces among them. Many stones are solid black, and others turn smoky dark grey and slightly see-through at their thinner edges, where light passes into the stone. A few carry pale veins, and some show a brown patch on one side. Because the stones were shaped from larger pieces and tumbled together, no two have quite the same outline. The polished faces catch a window or a lamp as soft white highlights, and the smoky stones look closest to dark glass when you hold them up to the light. Handle a few stones and the differences in gloss and shade become easy to sort. The larger stones fill the palm, and the smaller ones sit easily under a fingertip, so one pound serves for both handling and display.
Practical Ritual Applications
Crystal guides pair onyx with strength, protection and grounding, which makes a black stone a natural marker for the edge of a space. Lay one at each corner of your Tarot cloth before a reading, or set a ring of them around the base of a candle in a holder. Hold a stone while you shuffle, then set it down beside the cards you draw. Pocket one on a day when you want a small, weighty reminder to stay steady, or keep a few in a dish by the door. A handful scattered over a white cloth shows the contrast between the gloss and the smoky pieces. For more stones with a grounding association, browse my grounding and earth energy tumbled stones.
How to Work With Black Onyx Tumbled Stones
Three steps for sorting a pound of black stones and giving each a job.
- Sort by Gloss and Shade
Pour the stones onto a light cloth beside a window and look at each one against the white. Set the deepest, most even black stones in one pile, the smoky grey ones in another, and any with veins or brown patches in a third. Pick five or six of the best for a grid or an altar dish and keep the rest in a bowl where you can swap them in and out.
- Mark the Corners of Your Space
Choose four similar stones, near 20 to 30mm if you can, and set one at each corner of your reading cloth, desk mat or altar. Add a smaller stone beside your deck as a weight for the top card. Leave the stones in place for as long as the arrangement suits you, and rearrange them whenever you want a fresh layout or a different shape.
- Wipe, Dry and Store
Warm soapy water and a soft brush are the usual way to clean black onyx. Ultrasonic and steam cleaners need caution, because moisture and chemicals can work into the stone's pores, so a gentle hand wash is the safer choice. Dry the stones with a soft cloth and keep them in a pouch or a lined dish.
The Tarot Fellow Standard
I stock this lot for people who want a classic black stone by the pound in sizes that cover both pocket and palm. At 10 to 30mm the smaller stones slip into a pouch and the larger ones fill a hand, and a full pound gives you plenty for a grid, a bowl beside your reading table and a few to hand to friends. Black reads well against a Tarot cloth and a lit candle, and the polish keeps the stones pleasant to handle. For more stones sold by the pound, browse my bulk tumbled stones collection.
Frequently Asked Questions
Dyeing is common for black onyx. Most of the black onyx on the market is grey or banded chalcedony colored black by soaking it in sugar solution and then in acid, which leaves carbon inside the stone. The result is stable under normal handling, and the usual trade practice is to disclose the treatment. Onyx with natural black and white bands is generally left undyed.
Both are banded chalcedony. Onyx has straight, parallel bands, while the banding in agate is often more chaotic, curving and looping through the stone. Black and white banded stone with roughly parallel lines can be classed as both agate and onyx, so the two names overlap.
Crystal guides give onyx the root chakra, also called the base chakra, in the modern seven-chakra system. They list strength, protection and grounding as its themes. These are crystal-practice associations, so treat them as ideas for reflection.
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