KarinMT (search for her posts) has written a lot on Super White.

ETA - she is a geologist and an outstanding resource on stone

I think that super white is a dolomite, so it will etch. If I remember correctly, Karin said that some slabs are more like marble, some more like granite when it comes to hardness. My neighbor and a friend both have super white in their kitchens, beautiful for sure!

We recently purchased (and are loving!) our White Macaubus Quartzite counters. I read everything I could get my hands on beforehand, and when we went to choose slabs, I had an old iPhone, extremely sharp tweezers, a pocket knife, a small Phillips screwdriver, and a small ziplock bag of sliced lemons in my coat pocket. I scratched, scratched some more, repeatedly scrubbed with lemon, etc. Discretely, of course : )) I originally was going to bring an empty baby food jar as someone recommended, but having recently replaced my ancient, broken iPhone 4S, that glass worked very well. Some stone places will really know their rock, but IMHO, many times the sales person or the guys moving the slabs around really don't know any more than you or I, so read Karin MT's many posts and test, test, test.

Hi Kathleen,

You're on the right track by asking questions and learning as much as you can.

Super White is dolomitic marble, not quartzite. Fantasy Brown is also marble.

This article, http://usenaturalstone.org/definitive-guide-quartzite/, explains how to do the testing for hardness and acid resistance. You're correct that if the stone scratches glass it could be quartzite. It could also be granite. Marble does not scratch glass, but both Super White and Fantasy Brown can have occasional bits that might scratch glass, but overall, the minerals in those stones are softer than glass, so they won't scratch it.

Hope that makes sense, and good luck!

Hi. I would appreciate some more advice. I need to make a decision soon.

I've done testing and the stone has only superficial scratches after using a swiss army knife and a cutter. It didn't scratch a drinking glass, so not quartizite, I guess. Several items slightly stained it but the stains were removed with baking soda. There was one issue, though.

The one item holding me back is the etch marks. I tested before and after sealing the stone shows etches in both instances. Is there a special sealer to protect against etching? Is there a way for me to get the etching out? I searched and saw that on honed stone some people were successful with a green scotchbrite. Anything for polished granite/quartzite/marble, or whatever they're calling the stone I've selected??

You will only know once you test it. Different yards label stones differently.

Oh I see you already tested it. If it is staining & already showing scratches I would say it's a marble. With two children I would personally stay away from it.

Hi Kathleen- We are looking at the exact same stone. Did you end up with it? How did it turn out? Any information would be greatly appreciated!

This is the quartzite we purchased 5 years ago. I don’t recall the name, but we love it and have never had a problem and no babying in this family.

Thank you! Beautiful stone! We’ve been looking at fantasy white quartzite which I read is half quartzite and marble so we might avoid. We also found Florida wave which we don’t see often and really like but nervous it’s mislabeled and might be something else as well. So confusing. I really want quartzite but might be scared into choosing a quartz.

Don't be scared - be informed! You can do your own tests and learn what you need to know.

https://usenaturalstone.org/how-to-be-your-own-stone-sleuth/