Naked Science Forum

Non Life Sciences => Geology, Palaeontology & Archaeology => Topic started by: Desafina on 18/04/2021 12:50:26

Title: What kind of rock is this?
Post by: Desafina on 18/04/2021 12:50:26
 A few years ago in Venezuela, parque nacional de Cainama, the tourist guide found and gave me this rocks, he told us that a geologist told him that those could be radioactive but no one believed him. Nowadays I'm very curious of what kind of rock it may be.
Title: Re: What kind of rock is this?
Post by: Bill S on 04/05/2021 18:14:42
Hi Desafina. Welcome to TNS.

I’m surprised that none of our resident geologists has responded; so, for the time being, perhaps a word or two from an ancient, one time amateur would, at least let you know that you are not being ignored. 

It looks like a ferrous concretion; possibly limonite and/or goethite. Not sure what the central part is, but it will have been the catalyst around which the ferrous layers were deposited.

Don't give up on TNS, it's a much better forum than your initial experience might suggest. 

Stay safe, Bill.
Title: Re: What kind of rock is this?
Post by: Zer0 on 29/05/2021 19:17:27
Greetings Desafina!
🙏
& From All of US, Welcome to TNS SF.
🥳

Umm...i got no clue as to what that is... I'm no Geologist.
☹️

To Mee it looks like a seed of some sort, or maybe even rotten potatoes.
🤭

But yeah, sounds strange...the Guide just  handed it over to You?
No money charged eh?
🤔

& You simply took it...knowing it's Radioactive?
😲

Bravado!!!
👻

No Worries, someone out here would surely figure this out for ya.
👍


P.S. - @Bill S
HeeY Bill!
🙋
Where have You been?
😑
Hope all's Well?
🤞
Welcome Back!
😊
Title: Re: What kind of rock is this?
Post by: Bass on 15/09/2021 02:15:50
Looks like a goethite concretion. Iron is leached from elsewhere in the rock and commonly forms concretions in sedimentary rock. These may have originally been pyrite concretions.
Title: Re: What kind of rock is this?
Post by: Spamname 250921 on 25/09/2021 13:59:11
Hi
There are many stones in the world, some of which are very valuable and precious. You need to take this stone to the laboratory where they can do all the tests to determine if the stone is radioactive.
Title: Re: What kind of rock is this?
Post by: Just thinking on 25/09/2021 19:04:17
Nowadays I'm very curious of what kind of rock it may be.
I am most probably wrong but it looks like a contaminated agate.