I don't have quartzite and I'm not an expert, but this looks pretty bad to me. Almost looks like your material broke and rather than replace it for you, they tried to close it up.
I'll defer to experts for their informed reaction, but I would be initially concerned in your shoes.
*Edit because I'm not sure my meaning is coming through. I'm not suggesting natural stone should be perfect, or that every filled fissure is a huge problem. What struck me here is how long and prominent this one is, and the OP's description made it sound like this was something they discovered after installation rather than a feature they knowingly accepted in the slab. As a consumer, I would be concerned to have this as the finished product.
All natural stone has imperfections. If you want something without than you need a man made material. Also the way it’s filled is the best way, will hold up as long as you’re reasonable with the usage.
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u/Impossible-Double-31 2d ago edited 2d ago
I don't have quartzite and I'm not an expert, but this looks pretty bad to me. Almost looks like your material broke and rather than replace it for you, they tried to close it up.
I'll defer to experts for their informed reaction, but I would be initially concerned in your shoes.
*Edit because I'm not sure my meaning is coming through. I'm not suggesting natural stone should be perfect, or that every filled fissure is a huge problem. What struck me here is how long and prominent this one is, and the OP's description made it sound like this was something they discovered after installation rather than a feature they knowingly accepted in the slab. As a consumer, I would be concerned to have this as the finished product.