Quatrz countertop problem

[Nick Perez]

I just had someone install “quartz” countertops in our kitchen for a remodel I am working on for my first flip. I have a feeling that they didn’t actually install quartz. I noticed a couple of scratches and some minor chips in the stone on the edges. The installer said that it is a brittle material because it is man made. He said it isn’t resistant to extreme hot or cold. After doing some research online I’m finding quartz is neither of those things. They left some scrap pieces and I was wondering if there was a way to tell what the material actually is. Can I take it somewhere to get evaluated? Is there an obvious way to tell?

What should I do about this? He doesn’t have a contractors license. He has 1 more cabinet to install and then he is going to do all the handles and trim. Then he is done. If my suspicion about the fake quartz is correct I am not going to pay the final payment but what should I do to protect myself and the investment. Should I install security to protect the property in case he gets mad and damages the cabinets?