What is Onyx?
- Onyx forms from mineral-rich water in caves, as stalactites and stalagmites.
- Fine, uniform crystals build up in bands, giving it translucency.
- It is quarried, cut into slabs, often backed for strength, and polished.
Onyx is a translucent natural stone with dramatic banding, often used for statement islands, bars and backlit features.
Care tips
- Use pH-neutral cleaners
- Seal and reseal as recommended
- Best for low-traffic areas
Pros
- Unsurpassed decorative appeal
- Translucent; can be backlit
- A true showpiece
Cons
- Vulnerable to chemical attack (etching)
- Vulnerable to abrasion and scratches
- Often needs a backing for strength
What do the experts say?
- NSI: Onyx is a sedimentary rock formed as stalactites and stalagmites; its fine, uniform crystals give its translucency. [1]
- NSI: While vulnerable to chemical and abrasive attack, its decorative appeal is perhaps unsurpassed by any other material. [1]
LEED & green building
- Natural stone is listed by LEED v4.1 as an inherently non-emitting source of VOCs, so onyx without integral organic-based coatings can count toward the Low-Emitting Materials credit (sealers are evaluated separately). [2]
- Points from credits like this add up toward LEED Certified (40–49), Silver (50–59), Gold (60–79) or Platinum (80+). [3]
- Natural Stone Institute – Marble, Onyx, & Serpentine
- USGBC – LEED v4.1 Building Design and Construction (EQ Low-Emitting Materials; MR Building Product Disclosure and Optimization)
- USGBC – LEED rating system (Certified 40–49, Silver 50–59, Gold 60–79, Platinum 80+ points)
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