Question for Karin Mt

southernmumMay 9, 2013

Hey Karin - you're so knowledgable about granite, I just had to post this in case you're still around! I appreciate your great response on my Absolute Black post earlier. Since you know about this sort of thing, here goes another question, please: the granite I picked out for my island is a gorgeous slab of Winter Springs from Brazil. With all my research on granite this evening, I've discovered that a lot of granite from Brazil does have higher radon/uranium content. Would this be a deal killer, or no big deal? (*Can you tell that I have to sign away on all my granite and quartz tomorrow?!) Many thanks!!

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karin_mt

Hi SouthernMum,

That's a good question. I tried to look up Winter Springs granite but didn't find it.

What color is it? Uranium is found in true granites which are light in color. So you can rule it out if it's darker.

Either way, I don't think it's a deal killer. You can find scary stories about radioactive granite online but it's not prevalent. I wish I had a definitive answer for you, but it varies with every rock so there's not much I can tell you in absolute terms.

I would definitely not say that granite from Brazil is categorically risky. Brazil is a big place with lots of different rocks. We'd really need more info about the specific rock, rather than a blanket statement.

That said, I'd be interested to see the link where it says that, because I've never heard that before. Also, post a photo of Winter Springs so we can see what it really is.

Hope that helps!
Karin

    Bookmark   May 9, 2013 at 11:14PM
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southernmum

It says Winter Springs on the slab, and made in Brazil. I love the way it looks!!

    Bookmark   May 9, 2013 at 11:21PM
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southernmum

Duh,me!!! - it's WHITE SPRING! I don't know why I have such a mental block when it comes to the name of this granite! I went back and checked my photo of the tag on slab. Sorry, Karin! Hope this helps!!

    Bookmark   May 9, 2013 at 11:25PM
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karin_mt

The part on the left is granite pegmatite, so yeah that counts as granite, sure enough. But beyond that I really can't speculate.

Since you asked the original question I've been reading up on this topic, but there's no way to tell what's in a given rock aside from testing it. I know this is not very helpful, sorry! I still don't think I would worry about it though - the risk seems awfully small.

    Bookmark   May 9, 2013 at 11:43PM
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southernmum

Karin, thank you so much for your help, and for taking the time to read up on this for me! Many, many thanks!

    Bookmark   May 9, 2013 at 11:53PM
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karin_mt

I found some nice research that actually addresses these questions, if you feel like staying up all night reading.

Here is a link that might be useful: Radioactivity and radon in granite countertops

    Bookmark   May 10, 2013 at 12:08AM
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