Onyx
AntiEtch®
Aqua Onyx
Turkey / Pakistan
OnyxAntiEtch® Candidate
Green Onyx
India / Pakistan
ASTM C503Frost ResistantAcid SensitiveSealing RecommendedSofter Surface
Green Onyx
Photo coming soon
HardnessMedium(3–4 Mohs)
SoftHard
Acid SensitivityHigh Risk — Will Etch
SafeHigh Risk
Verify Before You Buy
Slab Yard Diagnostic Protocol
Limestone, travertine, and onyx are all calcite-based stones — they will react with acids and benefit from sealing. Your Stone ID Kit lets you confirm the chemistry and assess the slab's porosity before you commit.
From your Stone ID Kit
HCl dropper bottle (5–10%)Glass tileMagnifier
The full step-by-step protocol — including expected results and red flags — is included in your downloadable Buyer's Guide.
Stone TypeOnyx
Geological NameCalcareous onyx
OriginIndia / Pakistan
ASTM SpecificationASTM C503
ClassificationCalcareous — Consistent
Available FinishesPolished, Honed (Matte)
AntiEtch® FinishesPolished, Honed (Matte) only
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Backlighting Compatible
Onyx is naturally translucent and can be backlit with LED panels for stunning visual effect. Popular for feature walls, bar fronts, countertops, and fireplace surrounds. Requires specialized installation with a light box behind the slab.
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Seam Staining Precaution
Green Onyx can absorb oils from fabrication adhesives, potentially causing darkening along seams and edges. Ask your fabricator to seal all cut edges with an impregnating sealer before applying adhesive, and to use a non-staining epoxy rated for natural stone. This simple precaution prevents most seam-staining issues.
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MORE® AntiEtch® Protection Available
Green Onyx is a calcareous stone susceptible to acid etching. AntiEtch® provides permanent protection against lemon, vinegar, and other common acids.
Learn More🔬
MB Stone I.D. Kit — Test Your Stone
Not sure what stone you have? This kit includes the tools professionals use to identify stone type, test acid sensitivity, check absorption, and determine the right care products.
Shop Stone I.D. Kit — $139.97Premium Protection · MORE® AntiEtch®
Protect your Green Onyx
Green Onyx is a calcareous stone that etches from lemon juice, wine, and coffee. MORE® AntiEtch® stops it.
- Permanent acid-etch protection
- Invisible — keeps the natural finish
- Installed by certified pros
Alternatives to Green Onyx
Similar onyx stones and comparable options to explore.
