Fiebre Verde
Joined: 11 Sep 2013
Posts: 944
Location: Paris Area
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 Posted: May 12, 2019 14:43 Post subject: Re: Quartz and Humboldtine? from Colombia |
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| Bob Harman wrote: | Fiebre,
I am not a geologist so John R would be able to say more on this subject. Reread his original posting above on this subject.
However, from the article and what little I know, the answer is very complex and elusive. The yellowish color occurs mostly in fibers within the crystals rather than on the surface. Surface yellowish coloration, mostly due to iron oxides, has been ruled out, but its removal also posses a problem as when oxalic acid is used to remove the iron oxides, this seems to also affect the internal fibers in question, apparently forming humboldtine! . Humboldtine for the internal fibers was the early consideration, but is now suspected to be incorrect, except that testing after cleaning, repeatedly shows some alteration back to the humbodltine. The intimately admixed quartz fibers also interfere with testing, with various assays identifying only quartz.
All this is beyond me so other folks will have to add to this and explain more clearly. Bob |
Thanks for the reply Bob.
Then I guess the nature of these fibers is still under investigation.
Hopefully John R. will come up with an answer in the future.
Gerard |
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GregC12345
Joined: 15 Jan 2018
Posts: 5
Location: California
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| Posted: Jun 02, 2019 13:36 Post subject: Re: Quartz and Humboldtine? from Colombia |
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| Very interesting information, and much appreciated as all of you appear to have admittedly much more knowledge of the subject than I do. I recently bought a single crystal of the aforementioned quartz with the yellow inclusion. Has there by chance been any update or new information uncovered about what this is (rare or otherwise)? - Greg |
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