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A general guide for using the Forum with some rules and tips
Help needed to identify green mineral
  
  Index -> FOR BEGINNERS: What is it? Where is it from?
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Jemmas




Joined: 27 Feb 2017
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PostPosted: Mar 01, 2017 19:58    Post subject: Help needed to identify green mineral  

I am fairly new to this and would greatly appreciate some help. I discovered a green crystal/ mineral at a beach in Northumberland, England. It appears to be growing from a host rock. It is transparent underneath the white coating visible on the pictures. I have looked into possibilities such as sea glass and phosphate but raw emerald seems to look more like it. Please let me know your thoughts on this. Many thanks Jemma.


DSC_0051.JPG
 Mineral: Unidentified
 Locality:
Northumberland, England, United Kingdom
 Dimensions: 5x3x4.5cm
 Description:
 Viewed:  630 Time(s)

DSC_0051.JPG



DSC_0052.JPG
 Description:
 Viewed:  627 Time(s)

DSC_0052.JPG



DSC_0050.JPG
 Description:
 Viewed:  628 Time(s)

DSC_0050.JPG


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Bob Harman




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PostPosted: Mar 01, 2017 20:46    Post subject: Re: Help needed to identify green mineral  

The overall appearance and bubbly appearance suggests slag glass to me. If you can, do some basic tests on the example as described on this website. BOB
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Jordi Fabre
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PostPosted: Mar 02, 2017 02:54    Post subject: Re: Help needed to identify green mineral  

Bob Harman wrote:
...If you can, do some basic tests on the example as described on this website.
BOB

Here them are: What is it? - Where is it from?
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vic rzonca




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PostPosted: Mar 02, 2017 08:04    Post subject: Re: Help needed to identify green mineral  

With magnification you may be able to identify cleavage through the clear area along the interface of clear and green. Fluorite has obvious cleavage that may be apparent. Being green and gemmy, you have few choices. By the look of the matrix, I lean toward slag.
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Pete Richards
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PostPosted: Mar 02, 2017 11:28    Post subject: Re: Help needed to identify green mineral  

If you wet the surface of the green part with mineral oil, it will minimize the optical interference from the rough surface and allow you to see into the blob. This will work better than getting it wet, and much better than trying to look inside while it is dry.

If it is a mineral, you may see traces of cleavage. If it is a glass from slag, you are likely to see many gas bubbles. No absolute conclusions can be drawn from this - there are minerals without cleavage, and some minerals enclose bubbles of gas. But it would be useful evidence that will help you to decide one way or the other.

I don't think anyone has commented on your suggestion that it might be raw emerald. I think that is because no one thinks this is likely. I think it is almost certainly not emerald.

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Collecting and studying crystals with intersting habits, twinning, and epitaxy
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texasdigger




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PostPosted: Mar 03, 2017 03:13    Post subject: Re: Help needed to identify green mineral  

Hi Jemmas, Thats a really interesting piece you found.
I really like my specific gravity tests. Unfortunately looks like you have too much matrix for that to be accurate.
A good starting point is a simple scratch hardness test to eliminate possibilities. Fluorite is softer and glass will scratch it. Beryl (emerald) is harder and glass won't scratch it.
Oiling it will help clarity and you could see many gas bubbles indicating its glass.
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Jemmas




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PostPosted: Mar 03, 2017 05:21    Post subject: Re: Help needed to identify green mineral  

Thanks for all your comments. I really do appreciate your help. I will try the mineral oil and scratch test. I am leaning towards slag now as I can see bubbles inside.
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