Is Quartz Harder Than Granite

Mohs Hardness Comparison

The Mohs hardness scale rates minerals from 1 (talc, extremely soft) to 10 (diamond, hardest natural substance). A material can only be scratched by something of equal or greater hardness. This makes the Mohs scale the standard way to compare scratch resistance between worktop materials.

Quartz (the mineral) scores exactly 7 on the Mohs scale. Engineered quartz worktops are made from 90–94% of this mineral so the surface hardness is effectively 7 across the entire surface. The polymer resin component (6–10%) is softer than the quartz crystals but it fills the gaps between particles rather than forming a separate surface layer. The quartz crystals are what you interact with on the polished face.

Granite is not a single mineral. It is an igneous rock composed of several minerals in varying proportions. The main components are quartz (scoring 7), feldspar (scoring 6–6.5) and mica (scoring 2.5–3). Some granites also contain hornblende (5–6) and other minor minerals. The overall hardness of a granite slab depends on the specific proportions of these minerals which varies by quarry and even by block.

This means a granite slab might have areas where the surface is Mohs 7 (quartz-rich zones) directly adjacent to areas where it is Mohs 6 (feldspar-rich zones) or even Mohs 3 (mica-rich zones). Engineered quartz does not have this variation because the particles are distributed uniformly during manufacturing.

Why Hardness Consistency Matters

In theory the softer mineral inclusions in granite could make those specific spots more vulnerable to scratching. A steel knife blade (Mohs 5–6.5) cannot scratch the quartz crystals within granite but it could potentially leave a mark on a feldspar-rich or mica-rich area.

In practice this theoretical vulnerability rarely causes problems in real kitchens. The mineral variations in granite are typically at a microscopic scale and the harder quartz crystals surround and protect the softer minerals. You would need to deliberately target a mica inclusion with sustained pressure to create a visible scratch which is not something that happens during normal kitchen use.

However the consistency advantage of engineered quartz is real. If absolute uniformity of hardness matters to you (for example in a commercial kitchen or a very high-use domestic kitchen) quartz offers a guarantee that granite by its natural composition cannot.

Full Quartz vs Granite Comparison Table

Hardness vs Toughness: The Important Difference

There is a crucial distinction that many people overlook when comparing stone worktops. Hardness measures resistance to scratching. Toughness measures resistance to fracturing under impact. A material can be very hard but not very tough and vice versa.

Glass is a good example. It scores around 5.5 on the Mohs scale (harder than steel) yet shatters easily when dropped. It is hard but not tough. Diamond is the hardest natural material (Mohs 10) but it can be cleaved along crystal planes with a well-placed blow. Hardness and toughness are independent properties.

In worktop terms granite is generally slightly tougher than quartz. The interlocking crystal structure of natural granite gives it excellent impact resistance. Engineered quartz with its resin binders can be marginally more prone to chipping under sharp impacts particularly at exposed edges. The difference is small and both materials are far tougher than marble, laminate or glass. But it is worth noting that quartz's advantage in hardness does not automatically translate to an advantage in all types of durability.

What This Means in Your Kitchen

For Bedford homeowners choosing between quartz and granite the hardness comparison is interesting but not decisive. Here is what the hardness numbers actually mean in everyday kitchen life.

Neither will scratch from normal kitchen use. Kitchen knives (Mohs 5–6.5), pots and pans, ceramic plates and glasses are all softer than both quartz and granite. You will not scratch either surface with everyday items.

Both will resist cutting damage. Even if you cut directly on either surface (which we do not recommend because it dulls your knives) neither quartz nor granite will show visible knife marks under normal conditions.

Both need the same precautions. Use chopping boards to protect your knives. Avoid dragging heavy objects across the surface. Be careful with ceramic or diamond items. These habits apply equally to quartz and granite.

The real differences are elsewhere. Where quartz and granite genuinely diverge is in maintenance (quartz never needs sealing), heat tolerance (granite handles hot pans better), porosity (quartz is non-porous) and appearance (granite has natural uniqueness). These are the factors that should guide your decision rather than a marginal difference in Mohs hardness.

Better Reasons to Choose Between Them

If you are deciding between quartz and granite for your Bedford kitchen here are the factors that genuinely matter.

Choose quartz if you want zero maintenance (no sealing ever), a wide range of consistent colours and patterns, the best possible stain resistance or a marble-effect look without marble's maintenance demands.

Choose granite if you want a completely natural product with unique character, better heat tolerance for placing hot pans without trivets, the prestige of natural stone or you prefer the one-of-a-kind appearance that only nature can create.

At Precious Marble we work with both materials and can show you samples of each in our Bedford showroom. We always recommend making the decision based on which material suits your lifestyle rather than which scores higher on a hardness scale. Visit our quartz worktops Bedford page to explore your options.

Whether you lean toward quartz or granite our team can guide you to the right choice for your lifestyle and budget. Visit our quartz worktops Bedford page to start exploring.

Frequently Asked Questions

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This article is part of our growing Quartz FAQs hub where we answer the most common questions Bedford homeowners ask about quartz worktops. If you cannot find the answer you need feel free to call us on 01234 348590 or email info@preciousmarble.co.uk.