Novembr 16-18—COLUMBIA, SOUTH CAROLINA: Annual show; The Columbia, SC Gem and Mineral Society; Fri. 10-6, Sat. 10-6, Sun. 12-5
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 Post subject: two pieces...ID?
PostPosted: Sun Jun 17, 2018 4:36 am 
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For this smaller mineral, I guess it's calcedony,but I do not know what could be this bigger?This does not react to the muratic, cutting the glass, but I would say it's a little softer than calcedony (a scratch method)?
In the background you have a love euphoria(snails) :oops: =D>


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Last edited by sashaas on Tue Jun 19, 2018 4:38 am, edited 2 times in total.
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 Post subject: Re: two pieces
PostPosted: Sun Jun 17, 2018 4:40 am 
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another picture related to the previous post


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 Post subject: Re: two pieces...ID?
PostPosted: Thu Jun 21, 2018 12:58 pm 
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For me it is not a mineral but a rock

My first thought was Marble, but you told us that it scratch glass.
Marble can also include some level rich in silicium and the hardness of the rock may be tricky to check.

So my second pick will be between a Quartzite and perhaps a White Granite.


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 Post subject: Re: two pieces...ID?
PostPosted: Thu Jun 21, 2018 6:02 pm 
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Thanks for your reply :wink:


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 Post subject: Re: two pieces...ID?
PostPosted: Sun Jun 24, 2018 11:29 pm 
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Remember, glass scratches glass. Anything of with equal hardness will scratch itself.

Hardness points would be a good thing to invest in.
Muratic acid to seperate calcium carbonates from others.
Observing fractures and cleavage.


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 Post subject: Re: two pieces...ID?
PostPosted: Mon Jun 25, 2018 2:16 pm 
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Barbra Voltaire wrote:
Remember, glass scratches glass. Anything of with equal hardness will scratch itself.

Hardness points would be a good thing to invest in.
Muratic acid to seperate calcium carbonates from others.
Observing fractures and cleavage.

Thanks :wink: ,but I have no idea,what this stone could be... #-o


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 Post subject: Re: two pieces...ID?
PostPosted: Mon Jun 25, 2018 4:49 pm 
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Then you either need to learn how to identify unknowns or bring it to someone who does.


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