Marble, Granite or Quartz: What Is the Difference?

What each one actually is

Marble is a natural stone made mostly of calcite. It formed under heat and pressure over a very long time, which gives it soft veins and cloudy patterns. Egypt quarries a lot of it, mainly in beige, cream and golden tones.

Granite is also natural, but it is an igneous rock that cooled and hardened from molten material deep underground. That is why it looks speckled or grainy rather than veined, and why it is much harder than marble.

Quartz, in the showroom sense, is engineered. Factories bind crushed natural quartz, usually around 90% or more of the slab, with resin and pigments. The result is an even slab with no pores.

One name causes confusion: quartzite. Quartzite is a natural, hard stone that has nothing to do with engineered quartz except the word. If you hear it from any supplier, ask to see the slab and ask plainly whether it is natural or engineered.

Hardness and scratches

Hardness is measured on the Mohs scale, from 1 for talc to 10 for diamond. Marble sits around 3 to 4. Granite sits around 6 to 7. Quartz slabs are mostly quartz, which is around 7, so they resist scratching well in daily use.

In practice, a steel knife, or a pot dragged over a grain of sand, can mark marble, especially when it is polished. Granite and quartz take the same treatment much better. No surface is scratch-proof, so a cutting board is a good habit on any of them.

Heat

Granite formed from heat, so it tolerates hot pans better than the other two. Even so, a trivet protects it from sudden changes and keeps the surface looking even.

Quartz is the one to be careful with. The resin that binds it can discolour or crack under high heat, so pots should never go straight from the stove onto it. The same resin is affected by strong sunlight over time, which is why quartz is not used outdoors.

With marble, the everyday concern is usually not heat. It is acid.

Stains and etching

Stains and etching are two different problems. A stain is something soaking in, like oil, coffee or turmeric. An etch is a dull patch where an acid has eaten into the surface, even if nothing soaked in.

Marble is made of calcite, and acids react with calcite. Lemon juice, vinegar, tomato sauce, fizzy drinks and some spray cleaners can leave dull marks on it quickly. Marble can also stain if spills are left, particularly the light colours.

Granite is not etched by kitchen acids the way marble is. Its porosity varies from one granite to another, so some types need occasional sealing and some barely absorb anything. A drop of water on the slab in the showroom tells you a lot.

Quartz is non-porous. It needs no sealing and resists stains well. Wipe a spill and it is clean.

Looks and feel

Marble has soft, flowing veins and depth of colour, which is why many people choose it for halls, bathrooms and stairs. No two slabs are exactly alike.

Granite looks grainy or speckled, with flecks of black, grey, white, gold or red. It hides crumbs and small marks well, which is part of why it is so common in Egyptian kitchens.

Quartz looks even and controlled. You can get pure whites, solid greys and marble-look patterns that repeat closely from slab to slab. Some people like that consistency. Others find it less alive than natural stone.

Where each one wins

Many homes mix them: granite or quartz in the kitchen, marble on the floors and stairs.

• Kitchen countertops with heavy daily cooking: granite, or quartz if you are careful with heat.
• A bright white kitchen that is easy to clean: quartz.
• Indoor floors, stairs, skirting and wall cladding: marble, especially Egyptian beige and golden types.
• Bathroom vanities: any of the three, with extra care for marble around cosmetics and cleaners.
• Outdoor steps, terraces, entrances and sunny window sills: granite, not quartz.
• A feature piece where the veins are the point: marble.