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d_day

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Posts posted by d_day

  1. If you have access to a short wave UV light you can test for tungsten. Scheelite (tungsten ore) will fluoresce white or bright blue. If it fluoresces any other color or no color at all then you don’t have tungsten.

    i think Bob is probably correct saying you’ve got iron stained quartz and a mix of limonite and magnetite.

  2. To start with, every app I’ve tried for identifying rocks has been terrible. I’ve tested them with at least 10 known specimens and they all got every one of them wrong.

     Next, the first pic your app shows up there isn’t even a natural stone. It has very obviously been carved. You can still see the marks left by the burr they used. That tells me the app you’re using is completely worthless. 

    There is nothing to indicate your piece did not originate on earth. I’m not sure what you’ve got but I’m pretty sure it didn’t come from space.

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  3. 12 hours ago, DarkSilicate said:

    I'm no expert but to my eye they all look like microcrystalline varieties of quartz.  Fairly common in some locals.

    Edit: it seems I’ve quoted the wrong person. I meant to quote pondmn who stated that you might look into a local rock club.

    This is probably the best advice you’ll get. Here’s a list of clubs that are members of the California Federation of Mineralogical Societies. They’re sorted by name so you might haves to look through the whole thing to find one near you.

    https://cfmsinc.org/cfms-member-club-list/

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  4. 3 hours ago, Quigi said:

    Just did a scrape test (on the back of a brown ceramic kitchen tile so I don't know if that counts) and it was white (colourless?) and it didn't really seem to scuff the mineral at all.

     

    Between that and your test with the knife we can rule out serpentine. Glaucophane is still a possibility, though I think jadeite is more likely. There are probably a few other possibilities. 
     

    Keep in mind though that making a proper ID from photos is difficult under the best circumstances.

  5. My first thought on that piece was carborundum, but I rules that out as soon as I saw the big crystals. There’s a few things that could be going on there. Those could be crystals of the actual mineral, those could be crystals of one mineral with a coating of another mineral, or it could be a pseudomorph, where one mineral grows and is then replaced by another mineral. 
    What is it though? I have no idea. It almost looks like vanadanite coated in manganese (hollandite or romanechite), but I’m pretty sure that’s not it.

  6. 18 minutes ago, GotAU? said:

    It may or may not be a steinkern though, difficult to tell by the photos and we have no idea what type of deposit it came from. Would be probable if it was a marine sedimentary deposit.

    Honestly, I’m thinking crinoid stem pieces. I’ve zoomed in on the holes.

    277F1BB6-4A82-4ABA-A9FD-BEA3763BAC1E.jpeg

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  7. Looking at those holes makes me think you may have a mold fossil. That happens when an organism dies and is buried. The organism decomposes and leaves behind a hole in the shape of its body. 

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  8. 2 hours ago, Eureka said:

    Beautiful photos, very detailed, i can see in  the center there is three diamonds.  from there it has grown out wards blending with the amber diamonds, forming the cracks as it grew, imagine the chemical reaction that occurs as it grows, if you have ever smelted gold and watched it very close the cracks are very similar to  the pattern you have on your stone.  it also has traces of rare earth minerals so it may have platinum or silver along the color edge. ( an oil slick_ is what i refer it too.. or carbon maybe . makes it shinny. but if it sat in water it would make a iridescent layer on the water. 

    That would give you an idea of how it was formed in nature. 

    I agree that  coal would contain this as well as its red to black. 

    if you look very close you will see every individual cell that formed... :)  well that is what i can see. 

     I dont know what they name it though. insert your name and then add ite after it...:) 

     

    No.

     

    just no.

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