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Black, metallic, yellow oxide?
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Linus




Joined: 06 Nov 2015
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PostPosted: Jul 23, 2021 17:36    Post subject: Re: Black, metallic, yellow oxide?  

I'm debating on the Connecticut provenance though, could also be Rwanda, Uganda... I'm hoping I may be able to tie that down too. You guys have been very helpful. I'm about 95% convinced on the species (and the yellow oxide too!). Cool that its a rare and interesting piece!
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Bob Carnein




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PostPosted: Jul 23, 2021 18:40    Post subject: Re: Black, metallic, yellow oxide?  

This is a great find of a classic pseudomorph! Congratulations.
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Johan Kjellman




Joined: 10 Jan 2014
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PostPosted: Jul 24, 2021 12:18    Post subject: Re: Black, metallic, yellow oxide?  

Linus wrote:
I'm debating on the Connecticut provenance though, could also be Rwanda, Uganda... I'm hoping I may be able to tie that down too. You guys have been very helpful. I'm about 95% convinced on the species (and the yellow oxide too!). Cool that its a rare and interesting piece!


Apparently there are similar pieces also from French, Portugese and Japanese localities.

cheers
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Linus




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PostPosted: Jul 24, 2021 14:52    Post subject: Re: Black, metallic, yellow oxide?  

Yes indeed. I'm trying to get some documentation on its possible whereabouts, but we'll have to see how that goes.
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deadhead




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PostPosted: Oct 26, 2021 15:59    Post subject: Re: black, metallic, yellow oxide?  

SteveB wrote:
Magnetite? Yellow oxide it often zinc related and here it may have nothing to do with the crystal itself but from the host matrix. Could be residue from “YellowTak” similar to “BluTak” that rubbery gum stuff you use to stick posters to your wall. Its commonly used to “stick down” mineral samples into small cases. If it is it could be crumbly or maybe still sticky depending on how old it is.

Did you yourself collect this in the field? Where exactly? Or was it given to you or did you buy it? The yellow I’m certain is related to previous adhesive material and nothing to do with mineral. More testing needed like mentioned in the sticky forum thread on what to do before posting a photo and asking what is this. It wastes everyones time and discourages relevant answers. So read that thread and host back with more data.

My guess for now is magnetite. Just a guess.
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