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Onyx Natural Stone Slabs

Translucent. Backlit, it stops conversations. Unlit, it starts them.

Some Frequently Asked Questions About Onyx Natural Stone Slabs

What is onyx, and why is it translucent?

Onyx (in the stone industry sense) is a banded calcite or aragonite deposit formed by mineral-rich water flowing through caves and fissures over millions of years. Each band represents a layer of calcium carbonate precipitated from solution — the same process that forms stalactites and stalagmites. Unlike marble, which forms under heat and pressure, onyx forms at low temperatures through slow chemical deposition. This layered structure is what makes onyx translucent: the thin, parallel bands of crystalline calcite transmit light between them rather than scattering it. When backlit, the bands glow at different intensities depending on their thickness and purity, creating the luminous effect that makes onyx unique among natural stones.

What gives different onyx varieties their colours?

Each colour comes from a specific dissolved mineral carried by the water during formation. Green Onyx gets its colour from copper compounds and chlorite minerals in the groundwater. Honey and Amber Onyx are coloured by iron hydroxides (limonite). Pink Onyx contains trace manganese. White Onyx is the purest form — nearly pure calcium carbonate with minimal impurities. Rainbow Onyx formed where the groundwater chemistry changed over time, depositing different minerals in successive bands. Because the stone forms layer by layer over geological timescales, the colour record in a single slab is effectively a chemical diary of the water that created it — sometimes spanning hundreds of thousands of years.

Why is onyx more expensive and fragile than marble?

Onyx deposits are far smaller and rarer than marble beds. Marble forms from entire limestone formations that can extend for kilometres — onyx forms in isolated caves, fissures, and spring channels. A productive onyx quarry might yield a few hundred blocks in its lifetime, compared to tens of thousands from a marble quarry. The stone is also more challenging to extract and process: its layered structure makes it prone to delamination along band boundaries if handled roughly, and it has a lower flexural strength than marble. This is why onyx slabs are often reinforced with a fibreglass mesh backing during processing — not because the stone is weak in compression, but because the bonds between layers need support against bending forces.

How does backlighting work with onyx, and what do I need?

Onyx's translucency means that LED panels placed behind a slab will illuminate the stone from within, making the banding pattern glow. The thinner the slab, the more light passes through — 20mm is standard, but some clients use 15mm or even 10mm veneers bonded to glass for maximum luminosity. The LED panel should be a uniform-light type (not individual point LEDs, which create hot spots) mounted 20–50mm behind the slab with an air gap or diffuser layer. Warm white LEDs (2700–3000K) bring out honey and amber tones; cool white (4000–5000K) emphasises greens and whites. RGB panels allow colour changes but work best with white or pale onyx. The electrical installation should be planned before the stone is fitted, as the panel needs to be accessible for maintenance.

Where is onyx best used in a home or commercial space?

Onyx is a statement material — it works best in locations where it can be the focal point and where its translucency can be exploited. Backlit feature walls in living rooms, reception areas, and hotel lobbies are the most impactful application. Backlit bar fronts and reception desks are popular in hospitality. Bathroom vanity tops and shower niches use onyx as a jewel-like accent. Dining tabletops — especially with integrated LED strips beneath — create a dramatic centrepiece. Onyx is not recommended for kitchen worktops or high-traffic floors due to its softer composition and layered structure. Think of onyx as the lighting fixture and the stone in one — it belongs where light and beauty intersect.