It doesn't make any difference what it is. It will always bother you. So unless your counter layout can avoid the area, find a new slab somewhere else. If you go to sell your home it will bother any potential buyers.

Are you asking are those areas, cracks or fissures? If so, yes. By definition a crack is a fissure.

@Jim trying to figure out if it’s a crack that happened during fabrication/install or a natural fissure. All the articles we’ve looked up can get confusing.

Were you there to template the slab? Do you have pictures of the slab before install? Does the "crack" go all the way through?

It doesn't make any difference if it cracked five billion years ago in the Precambrian Age or last week during the installation. It's still cracked. Tell them to replace it.

Following.. I can't wait to hear what the experts say.

Here are more pictures of only the island portion. Far back photo and some more close ups. Hope these help Joseph. I can also take more, just let me know.

The Earth is 4.6 billion years old. So I don't think it cracked 5 billion years ago! :)

I’m trying to see if it’s a cracked sink rail or whateve. Farther back, please.

No it’s the edge of an island, not a sink. That picture is the entire piece over the island.

No it’s the edge of an island, not a sink. That picture is the entire piece over the island.

How far does the slab over hang the end of the island and how is it supported?

If you did not want a natural flaw you should of looked at quartz. Fissures happen in any natural stone. It is no-ones fault... and should not hurt anything.

Well, it is a beautiful slab so I totally understand why it was chosen. I suspect that the overhang, insufficient support/ deflection and gravity explain the crack.

He should pull the island, finish the break, glue and polish. You may still see it, but it won’t catch a fingernail or contaminant again.

karin_mt: "The Earth is 4.6 billion years old"

I claim poetic license.

Works for me! :)