Some interesting crystal formations
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  1. #1
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    Steve

    Sep 2017
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    Some interesting crystal formations

    I thought I'd share a couple cool druzy and quartz crystal clusters I found out at my spot and wondering what some of those strange crystal formations are called, especially the superman emblem looking one
    in the first specimen?Click image for larger version. 

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    weekender, DDancer, fuss and 4 others like this.

  2. #2
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    papa

    Feb 2017
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    Real pretty specimens. I think macro photography of those would be mind blowing.
    Steve1236 likes this.


    "And so the population was gradually led into the demoralising temptations of arcades, baths, and sumptuous banquets. The unsuspecting Britons spoke of such novelties as 'civilisation', when in fact they were only a feature of their enslavement." Tacitus, Roman Senator and Historian, written AD 98.

    The Bald Eagle photo...he/she posed for me, gave me it's best American look. I felt privileged to get the shot.

  3. #3
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    Steve

    Sep 2017
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    That's a really cool idea, like maybe make some macro photo prints with cool lighting, even maybe macro under uv light or other color lighting.
    Kray Gelder likes this.

  4. #4
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    papa

    Feb 2017
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    Oh yeah.
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    "And so the population was gradually led into the demoralising temptations of arcades, baths, and sumptuous banquets. The unsuspecting Britons spoke of such novelties as 'civilisation', when in fact they were only a feature of their enslavement." Tacitus, Roman Senator and Historian, written AD 98.

    The Bald Eagle photo...he/she posed for me, gave me it's best American look. I felt privileged to get the shot.

  5. #5
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    Nice stuff. Interesting formations mixed together. In the first 3 pics and the lone clear one I'd call the formation tabular crystal. Its unusual for quartz and I've only ever seen it a few times, not sure why it occurs. Your material almost reminds me of Herkimier diamonds.
    Steve1236 likes this.
    Everyone Believes they have gold buried in the back yard... small wonder so few ever look for it.

  6. #6
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    Steve

    Sep 2017
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    Thanks DDancer, some of it reminds me of Herkimier diamonds as well but in small crystal clusters, we have something called Payson diamonds here in Arizona but it's a long ways from where I'm at. After you clean up the druzy specimens some are just unbelievably sparkly and clear as glass and some look dull like they are coated with something, I'm almost thinking it's the calcite or gypsum that's attached to a lot of the fire agate out there.
    DDancer likes this.

  7. #7
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    Steve

    Sep 2017
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    Need a little help again, the super man emblem crystal isn't quartz, it's no where near hard enough, it's not calcite because it has no reaction to vinegar, it's not selenite because I can't scratch it with my fingernail, so I went on mindat to check the minerals list again for the area I'm in and the only one that looks like what I have is colourless alunite crystals, I downloaded a few along with mine after more cleaning to get your guy's opinion?
    Click image for larger version. 

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  8. #8

    Jul 2018
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    You may need to get an accurate hardness number on it, when you say "its nowhere near as hard as quartz" what did you use to determine that? have you tried scratching it with a nail or pin?
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  9. #9
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    Steve

    Sep 2017
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    I was trying hard not to damage these crystals because I've only seen a couple of them in that formation but I took the smaller one and rubbed the bottom along a piece of glass and it wouldn't scratch, it actually broke and left some of the mineral on the glass, I should of updated sooner but a little later on I rubbed the cool formation part of the specimen and it scratches glass, so it's back to quartz lol.Click image for larger version. 

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  10. #10

    Jul 2018
    Wisconsin
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    What you could have there is a "Japan law" twinned quartz crystal rather than Alunite. Have a look at this link midway down the page.

    The Quartz Page: Quartz Crystals - Twinning

    The bottom side of that crystal is probably brittle and that could be why it broke off fragments when trying to scratch the glass.
    Steve1236 and DDancer like this.

  11. #11
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    Tommy

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    Those are really cool love the info given on them I like finding interesting rocks, I have alot to learn though Cool finds for sure
    Steve1236 likes this.

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  12. #12
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    Steve

    Sep 2017
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    Yeah alunite is only a hardness of 4 so it cant be that I'm thinking, thanks for the link fuss, I've actually seen all those formations in these druzy specimens but I still haven't seen quartz crater in rhombohedral or maybe trapezoidal shape, its pretty cool, by chance do you guys think maybe it's something else alteration into quartz or just a unique quartz formations?
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  13. #13
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    Steve

    Sep 2017
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    I think I found a match to the quartz formations, something called "hopper "
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  14. #14
    us
    Steve

    Sep 2017
    Az
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    By chance could some of these crystals be gemmy k feldspar adularia, here's some I found online and another reason for asking is I see adularesence in these crystals when I use the loupe with light, sorry if I'm bugging anybody but when I start listing I want to get it right, photos with the arrows is the adularesence I'm seeing in the crystals of mine.
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    Last edited by Steve1236; May 26, 2020 at 08:19 AM.

  15. #15
    us
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    fuss's link pretty well points out what I feel you have as well, even though I call them tabular crystals I am corrected. I doubt there's much if any feldspar as that would be pretty dominate in your specimens. Your local in AZ is not well noted for feldspar's. If you were in say the Pike's Peak region such an occurrence is likely as that's one area where I have found a number of feldspar altered quartz, feldspar variants as well as amzonite in pegmatite's. Where your finding your fire agate is unlikely to hold much if any feldspar.
    Steve1236 likes this.
    Everyone Believes they have gold buried in the back yard... small wonder so few ever look for it.

 

 
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