This site is replete with quartzite horror stories; start searching please.

I think having references and photos for quartzite installs would be important, always better to be safe than sorry

You absolutely want references and photos from the fabricator, and yes talk to those references. Like Joseph suggested, search here on Houzz for discussions re quartzite installation. Specifics include acceptable seams as well as the type of adhesive that should be used, and how much. Ask your fabricator how they install quartzite, to include the brand and type of adhesive. Professionals usually welcome questions and will readily answer.

Good luck with your project!

Your question piques my offer of some unsolicited advice: if at all possible you need to verify for yourself the materials you picked out-tile, cabinetry, appliances, everything. Regardless of your contractor’s reputation, it’s on you to communicate with them-don’t assume anything. They may not remember (or will even check) backsplash tile color or how you want it installed, for example. If something is wrong, or if you have a question about anything, do not hesitate to speak up.

IMO contractors are not kitchen designers so what are you doing for the kitchen design ? The designer should be an indepednat KD who has access to good cabinet companies , good fabricators for different materials . A contractor does what the designer designs ,

I will add when we had our quartzite installed 12 years ago our fabricator had never worked with it before - but he was very experienced with other stones & extremely methodical and it turned out great. It is not an inexpensive stone so you absolutely want to be confident with the fabricator - (he did say he was going to charge his next quartzite customer a whole lot more than he charged me bc it was such a PITA lol)

Yes. Some things that came up for us that may or may not be applicable for you:

Quartzite is known to be chippy on the edges and crack easily where the faucet holes are drilled. We have a few touched-up spots that don’t match very well.

How close to front edge can the sink cutout be made? Too far away is more difficult to use.

They seemed to have a hard time making our finished edges have a matte finish (to match our honed/leathered surface) rather than the polished finish they’re used to. Some edges still look shiny.

Can they make the sink corner radius match the sink? A tight corner will require finishing by hand.

What appearance can you expect for seams?

What if any sealer will be used? This depends on your slab and whether you want the color enhanced. Some quartzites don’t take sealer well and will leave a hazy mess.

We have a darker color, but there are many horror stories of lighter color quartzites showing blotchy staining around the edges months after install.

All that said we are very happy with our quartzite and would choose it again.

"Quartzite is known to be chippy on the edges and crack easily where the faucet holes are drilled."

This is due to edge profile selection and fabricator error respectively, not specific to quartzite.

"How close to front edge can the sink cutout be made?"

I've gone 2 3/8" already, but with a rail that small, strapping, not clipping, a sink in place is imperative. With an apron sink, it's the thickness of the sink apron which can be even less.