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Help to identify this rock, please
  
  Index -> What is it? - Where is it from?
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chz9392000




Joined: 31 Jan 2020
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PostPosted: Feb 02, 2020 10:20    Post subject: Help to identify this rock, please  

I guess its hardness is around 5.5 because it may scratch the glass plate, depending on the force I applied. I have a feeling of sandy texture however not very sure. I guess sandstone is generally softer. Any help is appreciated.


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 Mineral: Not sure of the name
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Bob Carnein




Joined: 22 Aug 2013
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PostPosted: Feb 02, 2020 10:29    Post subject: Re: Help to identify this rock, please  

Where is it from? Correctly identifying a rock such as this is difficult, even for a trained geologist who has the rock in front of them. Even then, a microscopic examination of a thin section may provide the only means of confirming the ID. Pictures are often misleading. If you know where it was collected, you may be able to find a reference on the geology of that area that includes a map showing distribution of rock types. This would help in narrowing down the identity.
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Herman van Dennebroek




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PostPosted: Feb 02, 2020 15:35    Post subject: Re: Help to identify this rock, please  

At first sight your specimen looks like sodalite. But as Bob mentioned it's very difficult to determine from a photo
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chz9392000




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PostPosted: Feb 02, 2020 16:09    Post subject: Re: Help to identify this rock, please  

Hi all,

Thanks very much for your responses! Unfortunately, I don't know its place of origin.
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Josele




Joined: 10 Apr 2012
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PostPosted: Feb 02, 2020 16:13    Post subject: Re: Help to identify this rock, please  

Could be a mafic igneous rock, gabbro type for example.

As said, without proper analysis is not possible to classify a rock with precision.

Bob gives a good clue with the geological map when it is easily affordable in your country.
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