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Purple mineral in greenstone
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Kara




Joined: 22 Jul 2018
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PostPosted: Aug 02, 2018 01:39    Post subject: Re: Purple mineral in greenstone  

The analysts work for national Geological Survey of Finland, in a research center dedicated to identifying citizen collected ore- and mineral samples. They are very dedicated to their work so I think the reliability shouldn't be a question. I sent the samples there three months ago but got the answer just now due to the volume of samples they have to analyze.

They have an identically coloured fluorite specimen there too. The exact colour of my samples is difficult to catch with a camera for the light conditions vary so much outside where I photograph them.

There is also an investigation lab here in Finland called The West Coast Minerals, by Mr. Joel Dyer, which has Raman Spectroscopy instruments and which provides also good micro- and macro photos of the samples. I am not familiar with these mineral studying techniques but isn't it kind of the the ultimate test for proving minerals? I don't know, please educate me with that. I think I could send one sample there too if this is very interesting for you.
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Kara




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PostPosted: Aug 02, 2018 08:57    Post subject: Re: Purple mineral in greenstone  

Hey I forgot I have a bigger piece in the garden, here a cell phone pic of it. Does this look any different?


IMG_1450.JPG
 Description:
bigger piece
 Viewed:  325 Time(s)

IMG_1450.JPG



IMG_1453.JPG
 Description:
bigger piece
 Viewed:  325 Time(s)

IMG_1453.JPG


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Bob Carnein




Joined: 22 Aug 2013
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Location: Florissant, CO

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PostPosted: Oct 20, 2018 18:26    Post subject: Re: Purple mineral in greenstone  

Kara sent me a specimen of the purple mineral, which I tentatively thought was diaspore. I sent a small piece to New Mexico Tech for XRD analysis. It is axinite-Fe, along with minor calcite and quartz. Sometimes these things take time!
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Kara




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PostPosted: Oct 21, 2018 12:27    Post subject: Re: Purple mineral in greenstone  

Thank you Bob so very much for your expertise and help. Mystery solved!
- Kara
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