Onyx
Translucent, dramatic, demands a careful home.
Onyx is a banded calcite stone, often translucent enough to backlight. It is soft, brittle, and reactive — best treated as a feature material, not a workhorse.
Telltale traits
- translucent banding
- dramatic veining
- high gloss
Best for
- • Backlit walls
- • Bar fronts
- • Powder room vanities
- • Fireplace surrounds
Avoid for
- • Kitchens
- • High-traffic floors
Cleaning routine
Daily
Soft cloth with water only.
Weekly
Stone-safe pH-neutral cleaner; dry immediately.
Deep clean
Professional polishing recommended.
Sealing
Yes — Every 6–12 months
High-quality penetrating sealer is essential.
What to avoid
Any acidic cleanerAbrasivesHeavy impacts
When to call a pro
Almost all onyx repairs should be done by a stone restoration pro.
Safe products & ingredients
Stone family: Calcium-based (acid-sensitive)
Use these products
- • pH-neutral stone cleaner (e.g. MB Stone Care MB-5, Granite Gold Daily Cleaner, Method Daily Granite)
- • Microfiber cloth + warm distilled water for daily wipe-downs
- • Impregnating penetrating sealer (e.g. Miracle 511, Aqua Mix Sealer's Choice Gold) every 6–12 months
- • Marble polishing powder for light etches
Look for these ingredients
- • Neutral pH 7–8 surfactants
- • Distilled or filtered water
- • Food-grade mineral oil (only on honed soap residue test patches)
- • Calcium carbonate / cerium oxide polishing compounds
Never use on this stone
Avoid these products
- • Vinegar, lemon juice, or any citrus cleaner
- • Bleach, ammonia, or all-purpose sprays (Windex, Lysol, 409, Mr. Clean)
- • Tub & tile or grout cleaners (CLR, Lime-A-Way, Soft Scrub)
- • Bar Keepers Friend, Magic Eraser, or any abrasive pad
- • DIY baking-soda + vinegar pastes
Scan labels for these ingredients
- Acetic acid (vinegar)
- Citric acid
- Hydrochloric / muriatic acid
- Phosphoric acid
- Sodium hypochlorite (bleach)
- Ammonium hydroxide (ammonia)
- Oxalic acid
Do's and don'ts at a glance
Do
- Blot — never wipe — spills immediately, especially wine, coffee, oil, and citrus
- Use coasters, trivets, and cutting boards on counters
- Dust mop floors before damp mopping with a neutral cleaner
- Reseal on a 6–12 month cadence; test with a water bead
Don't
- Don't let acidic foods sit — even a lemon slice etches in minutes
- Don't scrub with green pads, steel wool, or scouring powder
- Don't use 'natural' or 'green' cleaners without checking the pH
- Don't apply waxes or topical sealers that build a film
Frequently asked questions
Can onyx be backlit?
Yes — many slabs are translucent and stunning when lit from behind with even LED panels.
Does onyx scratch?
Easily. Treat it like a soft marble and protect from impacts.
Popular Onyx varieties
Step-by-step guides
How to clean Onyx
Onyx is soft, acid-sensitive, and often backlit — visible streaks are unforgiving. A microfiber + neutral cleaner routine is the only way.
How to seal Onyx
Onyx is fragile and translucent — the wrong sealer leaves visible patches under the light. Here's the conservative approach that works.
How to polish Onyx
Onyx polishing is high-risk — too much pressure cracks the slab. Here's the careful approach and when to stop and call a pro.