What is the difference between onyx slab and marble slab for countertops?
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- Jul 2,2026
What is the difference between onyx slab and marble slab for countertops?
Key differences: (1) Translucency - onyx is translucent (stunning backlit), marble is opaque; (2) Hardness - marble 3-4 Mohs vs onyx 2.5-3 (onyx softer); (3) Porosity - onyx more porous, needs frequent sealing; (4) Veining - onyx has banded patterns, marble veined; (5) Price - onyx more expensive. PFM recommends onyx for accent walls and bars, not daily-use countertops.
Onyx: Backlit
Stunning feature
Marble: Durable
Countertops
Onyx: Premium
Higher cost
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