The Wilde AltarA developing queer pagan library
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Gay-led and LGBTQ+ affirming. Lesbian, gay, bisexual, transgender, nonbinary, intersex, asexual, questioning people, and respectful allies are welcome. No role here is assigned by anatomy or orientation.

Crystal cabinet

Onyx

True onyx is parallel-banded chalcedony, a microcrystalline quartz, classically black and white. Shop onyx is often dyed agate. Mexican onyx is usually banded calcite, a different mineral.

Banded chalcedony onyx shows straight parallel layers, black and white or brown and white, translucent at a thin edge, while dyed black agate can look featureless and very glossy. The calcite sold as Mexican onyx shows softer, often wavy cream, green, or amber bands and is not as glassy as quartz. None of these visual rules replaces a seller who will say which material you are holding.

What it actually is

Material identity
Name used hereOnyx
Mineral or materialTrue onyx is parallel-banded chalcedony, a microcrystalline quartz, classically black and white. Shop onyx is often dyed agate. Mexican onyx is usually banded calcite, a different mineral.
HardnessVariable. True chalcedony onyx is about Mohs 6.5 to 7. Calcite sold as Mexican onyx is about Mohs 3. Unknown shop onyx should be treated as unidentified until you know which one you have.
How it formsChalcedony onyx is silica layered in cavities, the same family as agate, while the calcite sold as onyx marble is deposited by mineral springs and is a limestone cousin. Dye sits in the pores of pale agate because chalcedony will drink it, which is why one shop word covers three different origin stories.

Trade names and mix-ups

Onyx in jewelry shops is frequently agate dyed black, because natural solid-black onyx is uncommon, while sardonyx is the brown-red and white banded sibling with a long cameo history. Mexican onyx, onyx marble, and cave onyx name banded calcite or travertine, a much softer mineral, and green onyx is often dyed. If a bead is uniformly black with no bands, ask whether a dye bath was the real artist.

Care

If it is quartz-family and dyed, keep soaks short or skip them; dye can move, and salt is an abrasive storage method with no benefit. If it might be calcite, keep it bone-dry of acids, vinegar, lemon, and even long plain water, and do not store it in salt. Neither kind enjoys a steam cleaner or a drop onto tile. Wipe with a cloth appropriate to your certainty: dry if unsure. Sun fades nothing you need and can heat a stone for no reason.

Provenance

Most black beads called onyx come out of the agate-dyeing shops, much of that work in Indian cutting centers, while the calcite sold as Mexican onyx is a separate décor stone quarried for lamps and bowls. Neither supply chain is an occult emergency, but both deserve their real names, so do not pay black-crystal prices for dyed chalcedony and do not serve citrus from a calcite bowl.

Symbolism

  • two columns
  • a fingernail's namesake
  • dye and the undyed
  • a ledger

Folklore, only where it exists

The Greek onyx means fingernail or claw, a name for the banded translucency that can look like a nail's pale arc, and sardonyx was a premier cameo stone for Roman and later European carvers. Seals and portraits cut in banded chalcedony are a real lapidary history, long and well documented. Medieval books assigned virtues to onyx, sometimes gloomy ones, with their usual freedom. What they were not describing is a uniform black bead from a dye vat, and they were not describing a calcite lamp base. Modern banishing language attached to black onyx is recent merchandise. The Wilde Altar uses the straight bands, when they exist, as a picture of two columns: what was said, and what you can check. If your piece has no bands because it was dyed a flat black, the ledger still works and the label should admit the dye.

Cautions

An original practice

The Two Columns

  • A piece of onyx with a note of whether you believe it is chalcedony, dyed agate, or calcite
  • A page divided into two columns
  • A pen
  • A dry cloth
  1. 1At the top of the page, write the material note. If the note says probably dyed, let that humility set the tone.
  2. 2In the left column, write what was said: a promise, a rumor, a shop claim, a thing you said in anger.
  3. 3In the right column, write what you can check by Friday. Set the stone on the margin only if your material note says it is dry-safe quartz-family. If it might be calcite, set it on the cloth beside the page, not on damp ink.
  4. 4Circle one right-column item you will actually check.
  5. 5File the page and return the stone to a dry box, away from salt and away from the vinegar cupboard.
A band is a layer, not a verdict. What was said sits on the left. What I checked earns the right.

If ink transferred, wipe quartz-family onyx gently and dry it. Do not rinse a calcite piece to clean a ritual. Close the box.

A practical action. Check the circled item: the bank line, the bus time, the seller's answer, the apology you said you made.

Substitutions

  • A black and a white strip of paper side by side
  • A fingernail, which is the Greek joke, used as no tool at all beyond remembering the name

Beginner questions

  • Is black onyx natural? Sometimes banded black-and-white chalcedony is natural. A great deal of solid black jewelry onyx is dyed agate. Ask.
  • Is Mexican onyx the same mineral? No. It is usually banded calcite or travertine, much softer, and it dissolves in acid. Do not use those bowls for lemon or for elixirs.
  • Will black onyx banish bad energy if I soak it? No. Do not soak it, do not make elixirs, and do not outsource a boundary to a dye job.
HowliteHowlite, a calcium borosilicate hydroxide, naturally white to gray.AmberNot a mineral and not a crystal. Amber is fossilized tree resin. Copal is younger, less polymerized resin and is often sold as if it were amber.OpalOpal, hydrated silica, a mineraloid rather than a crystalline mineral. Precious opal shows play-of-color; common opal does not.