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Need help in identifying a mineral sample
  
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Makanudo




Joined: 04 Oct 2017
Posts: 5
Location: Belgrade

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PostPosted: Oct 05, 2017 01:36    Post subject: Need help in identifying a mineral sample  

The base looks like a coral, but feels like a stone, and the minerals are transparent.


SAM_3864.JPG
 Mineral: Quartz
 Locality:
Serbia
 Dimensions: 12cm
 Description:
 Viewed:  683 Time(s)

SAM_3864.JPG



SAM_3862.JPG
 Mineral: quartz
 Locality:
Serbia
 Description:
 Viewed:  682 Time(s)

SAM_3862.JPG



SAM_3860.JPG
 Locality:
Serbia
 Description:
 Viewed:  683 Time(s)

SAM_3860.JPG


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Bob Harman




Joined: 06 Nov 2015
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PostPosted: Oct 05, 2017 07:11    Post subject: Re: Need help in identifying a mineral sample  

MAKANUDO,
Your last picture shows the small translucent and well formed crystals to probably be calcite.
The middle picture best suggests the orange colored areas to probably be rusty iron staining on the surface of the basic druzy crystalline areas. The iron staining in patchy areas is quite common in many specimens.
The basic druzy crystalline areas are probably either calcite or quartz. Use a bit of dilute muriatic acid (pool acid) to check this. If there is fizzing, then calcite; if no fizzing, more likely quartz or something else. BOB
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Makanudo




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PostPosted: Oct 05, 2017 07:22    Post subject: Re: Need help in identifying a mineral sample  

Thanks for the info Bob.
I do not know where to find this acid, but shall ask.
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Bob Harman




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PostPosted: Oct 05, 2017 07:34    Post subject: Re: Need help in identifying a mineral sample  

Muriatic acid is 28% HCl. It is used for various home and commercial cleaning purposes including removing lime coatings. Should be available in home improvement and hardware type stores, even in your area. You also could use vinegar, but the fizzing will be much less apparent. BOB
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Joseph D'Oliveira




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PostPosted: Oct 05, 2017 07:34    Post subject: Re: Need help in identifying a mineral sample  

You can use household vinegar which should fizz on calcite.
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Joseph D'Oliveira
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Makanudo




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PostPosted: Oct 05, 2017 09:00    Post subject: Re: Need help in identifying a mineral sample  

Thanks for the help guys!
I only have alchoholic vinegar at the moment and I dipped the stone in it for 3 minutes, without visible fizzing on on any surface.
Here are the after photos.



SAM_3865.JPG
 Description:
 Viewed:  572 Time(s)

SAM_3865.JPG



SAM_3866.JPG
 Description:
 Viewed:  573 Time(s)

SAM_3866.JPG



SAM_3867.JPG
 Locality:
Serbia
 Description:
 Viewed:  579 Time(s)

SAM_3867.JPG


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Pete Modreski
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Joined: 30 Jul 2007
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PostPosted: Oct 05, 2017 11:42    Post subject: Re: Need help in identifying a mineral sample  

Your specimen still is very likely, calcite. In ordinary vinegar, the bubbling is very slow--hard to notice.

Another test; see if you can scratch it easily, by scratching gently, with the point of a small sharp knife (pocket knife). If calcite, it will be soft enough to scratch easily. Many minerals, like quartz, are harder than the steel and will not scratch at all with a knife.
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Makanudo




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PostPosted: Oct 05, 2017 17:35    Post subject: Re: Need help in identifying a mineral sample  

Hello Pete!

You were all correct.
It does scratch easily with a knife.
Thanks!
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