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Quartz Druzy Grown on Some Substrate?

Posted by Al User  
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Al User January 11, 2019 04:49AM
So I was browsing online and say this little guy. Thought he was cool until I saw the reverse picture. That looks like nothing I have ever seen. Any guesses what is going on with this specimen? Real/Fake-grown? and if Real what substrate is the quartz growing on?




Thanks as usual. You guys rock :P
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Al User January 11, 2019 04:56AM
And fwiw I saw this seller had another one (same seller different druzy quartz specimen) that looks like it might have lines from a oven:




Lines are similar to the ones from known "fake"green quartz:
https://www.mindat.org/mesg-55-372663.html




Edited 2 time(s). Last edit at 01/11/2019 05:12AM by Al User.
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Dale Foster January 11, 2019 07:16AM
I wouldn't go thinking fake just yet, you can get some odd looking epimorph structures with quartz where another mineral has been removed by natural processes.

Here is one I found last year:



Quartz that had grown around Fluorite crystals, the Fluorite having latterly been largely removed, although some relict material was left to confirm the identification.

I wouldn't like to comment as to what mineral the Quartz had grown over in the specimens you have put up the pictures of, but it looks authentic to my eye.



Edited 1 time(s). Last edit at 01/11/2019 09:14AM by Dale Foster.
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Chris Rayburn January 11, 2019 01:09PM
Agree with Dale. It's also unlikely someone would go to the trouble of faking something as common as drusy quartz.
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Richard Gibson January 11, 2019 04:58PM
Here's an example of quartz pseudomorph after anhydrite. Not saying that's what you have, but it is similar.

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Al User January 11, 2019 05:23PM
Chris Rayburn Wrote:
-------------------------------------------------------
> Agree with Dale. It's also unlikely someone would
> go to the trouble of faking something as common as
> drusy quartz.


Looking at other fakes I believe druzy's are added more often because they are easier to grow and make some items sell. (That seems to be the case with the fake green quartz out of china since many of those specimens had a core low grade quartz cluster.)
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Al User January 11, 2019 05:24PM
@Richard Gibson Wow that does look really similar.
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Wayne Corwin January 11, 2019 05:45PM
Al

Those are not rack marks on yours, they are something like calcite casts.
Yours is real, not fake.
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Gary Weinstein January 11, 2019 10:24PM
Al,
first photo, near thumb/palm shows a broken cross section of the green crystal. I believe it is tourmaline but it has been etched away. That explains the odd texture not seen before.
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