Quartzite is not quartz, and the GTA index shows it

Quartzite comes out of a quarry and gets cut into slabs. Engineered quartz is built to a recipe. Stone Wizards, a Toronto fabricator, describes every major quartz brand as running comparable chemistry at roughly 93 percent ground quartz and 7 percent polymer resin. That recipe is the reason an engineered line repeats itself from slab to slab, and the reason a quarried slab does not. A fabricator laying out an engineered kitchen can work from a sample chip. A fabricator laying out quarried stone has to work against the actual slab, because the veining in the piece on the rack is the veining that ends up on the island.

Ontario's workplace rules also treat the two as separate categories. The Ontario Ministry of Labour, Immigration, Training and Skills Development issued a countertop hazard alert on October 27, 2023, updated May 26, 2025, noting that engineered stone can contain up to 95 percent crystalline silica, far more than granite or marble. CCOHS puts engineered stone at 90 to 97 percent crystalline silica against under 45 percent for granite and under 5 percent for marble. Those figures govern what a fabrication shop owes its own staff on dust control, and they do not show up as a line on a homeowner's invoice. They are still evidence that the regulator does not read quarried stone and engineered slab as one material with two names.

Home Depot Canada's Ontario countertop table prices granite, marble and quartzite together at $51 to $114 per square foot installed, and prices Silestone quartz on its own line at $57 to $130 per square foot installed. That grouping is the plainest signal in this site's price data. Quartzite is filed with the quarried materials, and the engineered product is filed apart from them, by a retailer with no stake in the distinction beyond making its own quote sheet work.

Toronto fabricators publish much more detail on the engineered side than on the quarried side. Countertop Pro GTA's brand table for Toronto runs from Lucent Quartz at $50 to $80 per square foot installed up to Silestone at $100 to $150, with Caesarstone at $85 to $135, Cambria at $90 to $140 and HanStone at $80 to $130 in between. On the quarried side, Toronto General Contractors puts granite at $75 to $175 per square foot installed, and Better Marble puts marble at $90 to $250 per square foot installed across the GTA.

Nothing in this site's price data publishes a Toronto rate for quartzite by itself. The closest available figure is the grouped Home Depot Canada band of $51 to $114 per square foot installed, which covers three materials at once and was not measured for quartzite alone. A homeowner budgeting a quartzite kitchen in the GTA is therefore working from a proxy. That is worth naming plainly rather than papering over, because the same gap will show up when two shops quote the same slab and neither has a published rate to be measured against.

The site sorts 876 companies into 12 categories: Countertop Installation, Quartz Countertops, Granite Countertops, Marble Countertops, Porcelain Countertops, Solid Surface Countertops, Butcher Block Countertops, Laminate Countertops, Stone Fabrication, Bathroom Vanity Tops, Cabinet and Countertop Installation, and Kitchen Renovation. Quartzite is absent from that list. Quartz Countertops holds 175 companies, Granite Countertops holds 120, Marble Countertops holds 110 and Stone Fabrication holds 77.

One listing out of 876 carries the word in its name at all: The Quartzite Company by Elements of Stone, in Pickering, recorded under stone fabrication with a rating of 4.1 across 12 reviews. The business labels attached to these records point the same way. The ten most common labels in the index are kitchen remodeler at 228, cabinet maker at 111, countertop store at 88, granite supplier at 43, countertop contractor at 41, cabinet store at 40, stone supplier at 32, bathroom supply store at 30, marble contractor at 27 and bathroom remodeler at 24. None of them mentions quartzite.

What the index cannot do is tell you what is on a shop's rack. It records the categories a company is listed under, the label Google Maps gives it, a rating and a review count. It holds no inventory data. So the missing quartzite category is evidence about how this market names itself and how buyers search it, and it is not evidence that no GTA fabricator will sell you a quartzite slab. Those are different claims, and only the first one has data behind it here.

Most comparison writing on this question stops at hardness and porosity. In the GTA the practical constraint arrives earlier than that. A material with 175 companies listing it has a competitive quote market, published brand tables, and enough fabricators that a homeowner can get three numbers in a week. A material with no category and one name in 876 records does not have any of that, whatever its performance in a lab.

That shortage shows up as thinner pricing, as it does in other small categories in this data. Porcelain, which does have a category, holds 22 companies, and TecCorp Stone puts installed porcelain at $90 to $160 per square foot in Toronto against $70 to $130 for quartz from the same source. Solid Surface Countertops holds 8 companies and Butcher Block Countertops holds 3. Thin categories are where published Toronto figures run out first and where the honest budgeting method becomes three written quotes rather than a table.

For a quartzite question specifically, the useful move is to stop asking which material wins and start asking which GTA shops cut quarried slabs to order, then ask each of them what quartzite costs on their equipment. The index can help with the first half of that. It cannot answer the second half, and it does not pretend to.

The natural stone and fabrication categories are where the shops that cut quarried slabs sit. Stone Fabrication is the closest match at 77 companies, with Granite Countertops at 120 and Marble Countertops at 110 next to it. Countertop Installation, the broadest category, holds 300.

Geography narrows a shortlist faster than category does. The index puts 97 companies in Vaughan, 93 in Mississauga, 92 in North York, 71 in Brampton, 63 in Scarborough, 59 in Richmond Hill and 57 in Markham. Those are the largest counts in the dataset, and they are also where the fabrication shops with saws rather than showrooms tend to be recorded.

For the money side, the site keeps published Toronto and GTA figures in its cost guides rather than in the listings. The relevant ones for a quarried slab question are countertop installation costs in Toronto, granite countertop costs in Toronto and marble countertop costs in Toronto, with quartz countertop costs in Toronto covering the engineered side.

Small tops make the material difference look bigger than it is, because a different charge dominates. Blackwood Kitchens, an Ontario cabinet maker, quotes $1,800 to $4,500 or more installed for a natural stone vanity top, against $900 to $2,200 installed for a quartz top with an undermount sink and $600 to $1,200 installed for a cultured marble or acrylic top with a moulded integrated bowl. A quartzite vanity sits inside that first band, and the band is wide because natural stone is a family rather than a product.

The charge that dominates is the shop minimum. CGD Cabinetry reports that many Toronto and Mississauga fabricators set a minimum project size of roughly 35 to 40 square feet, so a four square foot vanity top is not priced at four square feet. That minimum applies whether the slab was quarried or manufactured, which means the quartzite question barely moves the total on a single vanity. Bathroom Vanity Tops holds 23 companies in this index, and vanity top costs in Toronto carries the published figures.