Amazing these days. I ordered two countertops from the big box,(our only game in town), and one of them arrived split in half. It also seems that a huge majority of u.p.s deliveies to our home arrive trashed.

try H20 glue. Its for exactly this. works underwater, wet or dry. I am a pro pool service tech and I use it all the time. Here I found the website. Here is a link that might be useful: h20 glue

did they give you a name? a sure way to test for quartzite as opposed to marble is the glass scratch test. you could probably even do it on the broken corner of the slab. you could get a glass tile (like a subway tile, or a spare piece of glass if you have it) and run it across the broken portion of the slab. Marble is softer than glass. So, if that slab turns to powder on top of the glass, you have marble. If that stone/slab edge actually scratches the glass (to where you see and feel a distinct ridge or cut in the glass) then you have a quartzite (or granite) the other way to tell is lemon juice. Quartzite will not etch. ever. Marble will. always. take some fresh lemons with you (or white vinegar) and put some drops on the slab corner (make sure they give you a sample of the exact slab you're looking to buy, not some other slab sample) Wait about 5-10 mins. wipe off. can you see an etch mark? it's marble. an etch mark looks like this (in the top corner) it will remove the polished finish and fill a bit rough this is a test I was shown. this was untreated marble. see the far left blotch? that's an etch. Ketchup, oil, lemon, vinegar and some other brown stuff. Some quartzite will stain, so the stain test isn't a for-sure. the glass test and acid-etch test is. BTW, no such thing as a 'soft quartzite', or partial quartzite. quartzite is made of almost 95% quartz. If it has some marble in it, or some 'crystal parts', then it's marble! that slab somewhat resembles a Macaubas quartzite. hard to tell from the pic. maybe Infinity or Fantasy? maybe SeaPearl? (this is a true quartzite)

Here is my experience. I have my original 50 year old bathrooms with 4x4 field tile with small spacing (my best guess is less than 1/16 inch - we had to scrape by hand with a utility knife) and the hall and primary needed to be regrouted. We did it diy and neither of us had ever done this before. My husband did the primary by himself (removal of grout and regrouting) and used spectralock epoxy. I did the hall bath by myself and used mapei unsanded with the sealer additive. i was out of town when my husband did the primary but he said it was a pain and it is already yellowing and staining. for the hall bath only the caulk has stained and its been more than a year. i would go with mapei hands down when we eventually renovate. and both baths are used at least twice a day for showers.