I don't have an answer on your stone, but it's very beautiful and I love all the colors that you're holding up to go with it! I have white perimeter cabs, white backsplash, navy walls, navy island and white marble on my island. I love navy and white together! Can't wait to see what you do.

Gorgeous

Red flags - there is no such thing as an acid rating of 5. Also, a hardness of 5 is unlikely. Marble is softer (3-4) and quartzite is much harder (7). Have a look through the rock thread and if you have more questions, post them either here or in the rock thread.

My quick advice is that this rock is one that definitely needs thorough testing before purchasing. It's right in that grey area where it looks like both marble and quartzite so the only way to tell is to test it.

karin-mt, I am just reading through the rock thread now. There is a lot of information in there. Can I tell them I want to do the glass test or do I need to try to secretly do it? And, if it scratches, does that mean I can assume it is etch resistant too?

I would not attempt it in secret - just be up front that you need to check before buying. It should be somewhat normal for people to want to suss these things out.

On the slab in your pic, the upper left corner looks broken. Use a thick glass bottle to try the scratch test there. I say thick because I don't want the glass to break in your hand. Normally you put the glass down on a table and scratch it with the rock, but that method doesn't work with a whole slab.

If the rock really scratches glass definitively, then you are most likely safe from etching. In some cases where two types of rocks are layered together (Fantasy Brown) then this rule fails. If in doubt, check in a few places on the rock, particularly where the color or texture looks different.

Would love to get an update on this - how have your Namibian Montblac counter tops held up?

This is a marble !!! not a quartzite !!! I have it and it etches big time also can stain, it is a soft marble just like Calcutta, Carrera It is a beautiful Marble !

It's probably a dolomite. Harder than a marble but softer than granite or quartzite. Less porous than marble but more porous than granite or quartzite. Some places will try to sell dolomite as quartzite. Check videos of muriatic acid test on different counter surfaces. Acid on granite or quartzite won't "fizz" but it will "fizz' on dolomite and marble because of the calcite levels. Muriatic acid will fizz more on limestone or marble than it will on dolomite but dolomite will still fizz where granite/quartzite will not.