Quartzite is a natural rock. Quartz is a manufactured product. The names being almost identical is the whole problem. Quartzite is metamorphic — sandstone compressed and heated over geological time — and scores 7–8 on the Mohs scale, harder than granite. Engineered quartz is roughly 90% ground natural quartz bound with polymer resin, scoring about 7. The practical difference is heat and sealing: quartzite takes a hot pan directly, while quartz resin begins to scorch above about 300°F (150°C). Quartz is non-porous and never needs sealing; quartzite is porous and needs sealing on installation and periodically after.
The numbers that decide it
| Mohs 7–8 | Quartzite — harder than granite |
| Mohs ~7 | Engineered quartz |
| ~90% | Ground natural quartz in an engineered slab; the rest is resin |
| 300°F / 150°C | Where quartz resin begins to scorch |
| Direct heat | What quartzite tolerates |
| Never / annually | Sealing: quartz never, quartzite roughly yearly |
Quartz vs quartzite at a glance
| Engineered quartz | Quartzite | |
|---|---|---|
| What it is | ~90% ground quartz + resin | Natural metamorphic rock |
| Made or quarried | Manufactured in slabs | Quarried |
| Mohs hardness | ~7 | 7–8 |
| Hot pan | No — scorches above ~300°F | Yes |
| Porous | No | Yes |
| Sealing | Never | On install, then periodically |
| Pattern | Consistent, repeats | Unique per slab |
| UV / outdoors | Can discolour | Stable |
Why the confusion is expensive
A buyer who asks for “quartz” and receives quartzite has bought a porous stone that needs sealing and will stain if they treat it like the non-porous surface they thought they were getting. A buyer who asks for quartzite and receives quartz has bought something that cannot take the hot pan they were promised.
Both mistakes are common, and neither shows up until months later. Ask the fabricator which one you are buying, in those words, and get it in writing.
Heat is the clearest separator
Quartzite’s hardness and heat tolerance both come from being rock. There is no resin to soften, so a pan straight off the hob is survivable.
Engineered quartz is mostly stone by weight, but the small fraction of polymer holding it together is the weak point. Above roughly 300°F that resin scorches, and the mark is permanent — it is not a stain on the surface, it is damage to the binder.
This is the same limitation engineered quartz shares with cultured marble, for the same reason. See our comparison of cultured marble vs quartz for what happens when the resin fraction rises.
Which suits a table
For a dining table, quartz is usually the sensible answer: non-porous, no sealing, no etching from wine or lemon, and the pattern consistency means a large top looks deliberate rather than patchy.
For a table that lives outdoors or in strong sun, quartzite. Engineered quartz can discolour under prolonged UV; quartzite is stable.
Frequently asked questions
Is quartzite the same as quartz?
No. Quartzite is a natural metamorphic rock, quarried in slabs. Engineered quartz is a manufactured product — roughly 90% ground quartz bound with polymer resin.
Which is harder, quartz or quartzite?
Quartzite, at Mohs 7–8 against quartz’s roughly 7. Quartzite is harder than granite.
Can you put a hot pan on quartz?
No. The resin binder begins to scorch above about 300°F (150°C) and the damage is permanent. Quartzite handles direct heat.
Does quartzite need sealing?
Yes. It is porous and should be sealed on installation, then resealed periodically — usually annually or every other year.
Does quartz need sealing?
No. It is non-porous because of the resin binder and never needs sealing.
Sources
- Pacific Shore Stones — quartz vs quartzite countertops
- Countertop Advisor — an installer’s guide to the difference
- Artistic Stone — key differences explained
- Carmel Imports — is quartz and quartzite the same
Choosing between surfaces is the first decision of several. The full picture, including which piece to buy and how to care for it, is in Marble Furniture: The Complete Buyer’s Guide.