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Marouenca




Joined: 22 Mar 2017
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PostPosted: Apr 17, 2017 05:36    Post subject: Help with this  

Hi, I just found a new rock and I don't have any idea what it is. I tested it with vinegar and got no reaction.


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robodoc55




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PostPosted: Apr 17, 2017 06:30    Post subject: Re: Help with this  

Hi,
to me it looks like Calcite
greetings
Robert
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Joseph D'Oliveira




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PostPosted: Apr 17, 2017 06:35    Post subject: Re: Help with this  

Not easy to tell from a picture, but if it isn't unusually heavy for its size and if it scratches easily with a knife, Trona could be one possibility.
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Josele




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PostPosted: Apr 17, 2017 06:52    Post subject: Re: Help with this  

Another vote for calcite (karstic calcite).
Reaction with cold vinegar is very low, try with hot vinegar and a pulverized sample or even better with diluted HCl.

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Dale Hallmark




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PostPosted: Apr 17, 2017 07:17    Post subject: Re: Help with this  

Looks like Calcite but also sometimes Gypsum looks like that too.

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sergio ruiz




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PostPosted: Apr 17, 2017 08:11    Post subject: Re: Help with this  

Hello,
Looks like a Calcite of a karstic place.
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Peter Perkins




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PostPosted: Apr 17, 2017 11:59    Post subject: Re: Help with this  

My immediate response was Gypsum; it is exactly like some of mine.
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SteveB




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PostPosted: Apr 17, 2017 15:50    Post subject: Re: Help with this  

Peter Perkins wrote:
My immediate response was Gypsum; it is exactly like some of mine.


Same here. But needs more information, please follow the forum guide and conduct some simple tests and post the results. Some pics of the other sides of the specimen could also help.
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Marouenca




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PostPosted: Apr 18, 2017 03:31    Post subject: Re: Help with this  

I did the hcl test and its negativ


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robodoc55




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PostPosted: Apr 18, 2017 07:12    Post subject: Re: Help with this  

Hi,
so I was wrong, it cannot be Calcite, as even weak HCl would have caused a reaction. Despite I'm not convinced by the looks, maybe the Gypsum voters are right?
I never met Trona, which was also discussed, so I can't judge it.
Greetings, Robert
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Pete Richards
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Joined: 29 Dec 2008
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PostPosted: Apr 18, 2017 08:17    Post subject: Re: Help with this  

I suspect it is gypsum. If it is, it should be very easy to scratch with a knife, and you should be able to scratch it with your fingernail. If you heat a sliver with a torch, it should turn white and chalky at least around the edges, due to loss of water from the structure.
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Collecting and studying crystals with interesting habits, twinning, and epitaxy
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