Quartz, quartzite and the word your salesperson is using loosely
One is a rock, one is a product
Quartzite is a natural stone, metamorphosed sandstone, quarried in slabs. Engineered quartz is roughly 90 percent ground natural quartz bound in a polymer resin and pigment, pressed and cured in a factory.
That resin is the whole difference. It is what makes engineered quartz non-porous and consistent, and it is what makes it vulnerable to heat.
What each one actually does
Engineered quartz will not stain, needs no sealing and arrives exactly like the sample. It will scorch from a hot pan and can crack from thermal shock near a range or a slow cooker vent. Use a trivet, always.
Quartzite takes heat without complaint, needs periodic sealing, and varies from slab to slab, which is either the appeal or the problem depending on your temperament.
The labelling problem
Some material sold as quartzite is actually dolomitic marble, which is softer and will etch from lemon juice the way marble does. If a slab labelled quartzite is unusually soft-looking and very white with grey veining, ask for the acid test before you commit.
A reputable yard will do it in front of you on an offcut. A yard that refuses has told you something.
How we choose
We ask how the household cooks, not which looks nicer. A home that regularly takes cast iron out of a 450 degree oven wants quartzite, granite or porcelain. A home that wants a white counter that stays white for fifteen years with no maintenance wants engineered quartz and a drawer full of trivets.
Written by the Lumen studio. Figures follow common North American kitchen practice and are guidance for planning, not a code citation.
