X-ray reveals a hidden fossil

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  • Опубліковано 18 жов 2024

КОМЕНТАРІ • 186

  • @MamlamboFossils
    @MamlamboFossils  7 місяців тому +4

    Thanks for watching everyone! If you want 100+ bonus videos, check out my Patreon channel: www.patreon.com/mamlambo

  • @johnbruce2868
    @johnbruce2868 7 місяців тому +20

    X-raying fossils has been around for a long while. It's an old technology but all we had in years gone by. A colleague had a complete baby plesiosaur we found together, that was encased in a 4' x 4' x 6'' slab, x-rayed some 35 years ago. It showed both the skin (body) outline around the bone and the head attached. Very (very!) useful to know before prepping. X-rays don't do 3D output but CD scans will. If you find another penguin or reptile fossilised in shale (when the remains are compressed between sediment - Lias style), I suggest an x-ray as a possible means of identifying any preserved soft tissue residues. It certainly worked for us in the UK. I'm less confident about finding soft tissue remains in phosphatic nodules. Perhaps preservation of remains under anaerobic conditions would help to prevent predation and decomposition of soft tissues?

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому +5

      The nodules we find are either calcite or dolomite, I'm not sure about soft tissue preservation, I will have to go take another look at those scans of the penguin! Appreciate the info, the plesiosaur sounds amazing!

  • @mrkthmn
    @mrkthmn 7 місяців тому +8

    I laughed hard at the structural crab! 😂

  • @brianjohnson3974
    @brianjohnson3974 7 місяців тому +8

    Incredible!!!! Printing out the fossil that's IN the rock!!!!

  • @stinkakatza
    @stinkakatza 7 місяців тому +14

    this is awesome. im glad i found your channel a while ago🤙🏻

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому +2

      Me too! Stoked you are enjoying the videos as well!

    • @CDWCAULDRON
      @CDWCAULDRON 7 місяців тому

      Happy prepping GL

  • @technonarg5978
    @technonarg5978 7 місяців тому +3

    This is fantastic,it will never get old watching you reveal fossils,virtual or actual.

  • @gwynnfarrell1856
    @gwynnfarrell1856 7 місяців тому +9

    It's amazing to me that the CT scanner can distinguish the fossilized crab from the surrounding rock. The printing technology is so cool! Thank you for sharing this fantastic process!

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      I'm glad you enjoyed it!

    • @joesmith-es1zy
      @joesmith-es1zy 6 місяців тому +1

      The crab shell is made of a different material then the surrounding rock, that's why it shows up as two distinctly different things on the CT.

  • @linuskorff4074
    @linuskorff4074 7 місяців тому +6

    This was awesome to watch, happy to have tuned in! Looking forward for the next video, also I will show you as I said, how the sea urchins turn out.

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому +1

      Thanks so much Linus, can't wait to see those urchins!

    • @linuskorff4074
      @linuskorff4074 7 місяців тому

      @@MamlamboFossils I'll keep you updated on them!

  • @catherinehubbard1167
    @catherinehubbard1167 7 місяців тому +1

    This whole process is so amazing. The 3D printing technology, both software and machine, seem miraculous to me. And that’s not counting the aspect that the subject is millions of years old and encased in solid rock you found on a beach! I hope the people in the radiology lab are enjoying this adventurous departure from people insides. With that wide smile of delight, I don’t have to wonder if you had fun with this. Thanks for sharing this unique experience.

  • @GaiusSonofGermanicus
    @GaiusSonofGermanicus 7 місяців тому +1

    Hi. It's amazing how tech allows non-invasive examinations of specimens like this. These techniques are used outside of paleology and in archaeology are so sophisticated that in some cases even texts can be read from artifacts that are far too fragile to be exposed.
    Thanks for the great videos - both entertaining and informative.

  • @jamesbarisitz4794
    @jamesbarisitz4794 3 місяці тому +2

    Pulling a bird from thin air isn't magic. Making an accurate model of a creature fossilized in rock without seeing it is 🎩

  • @a3skywarrior929
    @a3skywarrior929 7 місяців тому +4

    Awesome that you can look before prep...going to help you emencly

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому +1

      It's so good to be able to visualize it before prepping!

  • @Winny-woo-woo
    @Winny-woo-woo 7 місяців тому +3

    Fascinating, thanks for sharing... more please ❤

  • @Schmittyapolis
    @Schmittyapolis 7 місяців тому +5

    This is just friggin amazing! I can't believe so many crabs formed into rock

    • @nyuh
      @nyuh 7 місяців тому

      there mustve been so many crabs in the ocean

  • @salishseaquest7952
    @salishseaquest7952 7 місяців тому +4

    That. Is. So. Cool!! The whole process is fascinating. Thank you for sharing it with us.

  • @SCUBASUEReynard
    @SCUBASUEReynard 5 місяців тому +1

    Always enjoy looking inside those rocks with you.

  • @beverlylumley4150
    @beverlylumley4150 7 місяців тому +4

    Fascinating science

  • @ChainsawDNA
    @ChainsawDNA 7 місяців тому +4

    This is so cool! Thanks for sharing with us!

  • @asymDelegate
    @asymDelegate 7 місяців тому +1

    Literally just found your channel, immediately I can see you need your own x-ray machine! Amazing.

  • @jeannettefrye5086
    @jeannettefrye5086 7 місяців тому +3

    Extraordinary, spectacular video! Thanks for sharing this, made my week 👍👍😉⭐⭐

  • @tranquilvortex
    @tranquilvortex 7 місяців тому +2

    Very cool mate! You have so much fun and your happiness is contagious!
    I have a fossil crab with insides. Is that rare? The carapace is missing on top and you can see the internal structures. A fun find in any case!
    Always enjoy your videos and its interesting to see the technology you use to assist your endeavours.

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому +1

      I haven't found one before, I'd love to see your crab if you want to email me some pics: mamlambofossils@gmail.com

    • @tranquilvortex
      @tranquilvortex 7 місяців тому

      @@MamlamboFossils Sure, I'll take some snaps and send them to you. 😃

  • @capt.bart.roberts4975
    @capt.bart.roberts4975 7 місяців тому +1

    Things keep evolving into crabs.

  • @Bahnfyre
    @Bahnfyre 7 місяців тому +2

    It was really neat to see what was hidden inside - thank you for walking us through the process!

  • @Tokoroa3420
    @Tokoroa3420 7 місяців тому +1

    Here is an million dollar idea, a hand-held x-ray thingamajig that we can bring to beaches and scan every rock we walk pass.

  • @catfeatherss
    @catfeatherss 7 місяців тому +2

    Isn't that wonderful! Now begins the painstaking process of exposing this very old fellow at least vicariously to light once again after all the eons he's spent trapped in stone.

  • @perry92964
    @perry92964 7 місяців тому +1

    i would leave it like it is, displaying the rock with the crab on top with a plaque "this crab is inside this rock" way more interesting and conversational

  • @alphaomega4893
    @alphaomega4893 7 місяців тому +2

    Fascinating. Loved that one.

  • @mikhail-tikhonov
    @mikhail-tikhonov 7 місяців тому +1

    Cool, even scientists don't always use tomography to study fossils👍

  • @MotoLego
    @MotoLego 7 місяців тому +1

    Your computer scanned magic kung fu is strong.

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      Hahahah thanks Moto! It's so much fun looking at those scans!! I need a little portable one

  • @Ontario_Rockhound
    @Ontario_Rockhound 7 місяців тому +2

    Very cool video!

  • @MW15962
    @MW15962 Місяць тому +1

    That is fecking amazing, dude. Isn't new technology mind-blowing!

  • @patifagan6774
    @patifagan6774 7 місяців тому +2

    Awesomeness

  • @timcooper7845
    @timcooper7845 7 місяців тому +2

    That was great. So glad I watched this. Thank you.

  • @PaleoDutch
    @PaleoDutch 7 місяців тому +1

    An awesome insight on how 3d printing works. Love to learn more about it.
    I definitly want to give it a try aswel some day.
    Just one of many projects for in the future.

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому +1

      Your oreodont skull would be great to turn into a 3D model, I could then print it!

    • @PaleoDutch
      @PaleoDutch 7 місяців тому

      That would be something cool! We may could work on this somewhere in the near future😁

  • @catherine59226
    @catherine59226 7 місяців тому +2

    I enjoyed this very much!

  • @mikenoel3522
    @mikenoel3522 7 місяців тому +1

    Imagine if the X-ray had 4k resolution.

  • @D989501L
    @D989501L 7 місяців тому +2

    Come on Malambo, with your expert IT knowledge, I thought you would have coupled the scanner information to a ruby lazer by know so you could put in x,y,z axis and lazer prepped a fossil in minutes by now 😊. Regards Richard 🇬🇧

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      I've been playing around with some ideas 😄

  • @brianfeeley6140
    @brianfeeley6140 7 місяців тому +2

    Enjoyed this one... does the University charge you for using their CT scanner? I know from personal experience how expensive they are for us humans! Cheers!

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому +1

      This was done as part of Pacific Radiology's community outreach

  • @RockHoundingAdventures
    @RockHoundingAdventures 7 місяців тому +1

    Hey bro, this is way to cool. Next time I have a CT scan I’ll bring some concretions with me lol. The technology these days is pretty cool. Thanks for sharing man. Talk to you later

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      Lol, just strap a bunch to your leg 😁

  • @ChillBill1
    @ChillBill1 7 місяців тому +1

    fascinating!

  • @skalvar
    @skalvar 7 місяців тому +1

    What an amazing way of finding out whats inside! And to make a 3d print out of, wow! We sure have come a long way the last 20 years

  • @niklasgroth8096
    @niklasgroth8096 7 місяців тому +2

    That is perfect timing! I picked up a small concretion which has- what I think- a small skull sticking out. It has only like a 2cm diameter and I will be able to use a microCT machine of my university to scan it. Dou you have any advice regarding the beam power needed to get a nice scan on that scale?
    Also working and segmentating 3D CT and MRI scans is what I do part time, but mostly from wood related products, as that is what I am doing research about.
    If you ever want to have a very small fossil scanned you can hit me up and send it to germany, I should be able to provide a very detailed scan for you, our voxel size for a 2cm specimen is usually around 4 micrometers ;)
    All the best from Hamburg, Niklas

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      ah thanks Niklas! I will keep that in mind for sure! 4 micrometers is crazy detailed, this was taking at about 50. I have no idea on the beam size at all, the technician sorted all that out 😂 When you scan the skull, I would love to see the results! My email is mamlambofossils@gmail.com.

  • @EricWoodyVariety59
    @EricWoodyVariety59 7 місяців тому +1

    Awesome. I always wanted to find fossil crabs. I had a buddy who had a site but he wouldn't share the site with me.

  • @terryivinho3228
    @terryivinho3228 7 місяців тому

    I loved watching your 10x speed fossil prep video. I will subscribe if you do another. Would you could do it on this fossil?

  • @OutThereLearning
    @OutThereLearning 4 місяці тому +1

    awesome!

  • @Bothriolepis
    @Bothriolepis 7 місяців тому +1

    New York, Germany, Pennsylvania, Italy, Romania, New Zealand, Kentucky, and Michigan checked in

  • @marcingromek9685
    @marcingromek9685 7 місяців тому +1

    Amazing non-invasive tools for looking inside rocks.

  • @wendymontie5660
    @wendymontie5660 7 місяців тому +1

    So cool! Can't wait for more1 Cheers! (from the Dallas, TX area, USA)

  • @rodevans602
    @rodevans602 7 місяців тому +1

    Brilliant technology! Brilliant video! Thank you…

  • @mcmenace4847
    @mcmenace4847 7 місяців тому +1

    Mate that was awesome! Did it cost much to scan?

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому +1

      Pacific Radiology did it as part of their community outreach 😀

  • @brucetaylor2887
    @brucetaylor2887 7 місяців тому +1

    As always super cool. Be interesting to know if scanning can be booked and paid for and what the cost is.

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      I'm sure you contact a radiology place they will let you know! They enjoy doing cool things like fossils

  • @tinavainola9648
    @tinavainola9648 7 місяців тому

    Awesome video! You might have mentioned this before in one of your videos, but how can you tell which way is up on the concretion and which way is the bottom of the crab? Without the xray.

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      I get it wrong all the time, some people say the shape of the legs or concretion can give you clues. I often look to see if I see the larger bulge where the big crab claw is but if that's not visible it's 50 / 50 for me.

  • @TheAlastairBrown
    @TheAlastairBrown 7 місяців тому +1

    3d model then CNC mill the bulk of material away? Epic time saver, this could be a fun proof of concept experiment?

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      I've thought of that! I need some more experience with a CNC machine!

    • @TheAlastairBrown
      @TheAlastairBrown 7 місяців тому +1

      I have no idea either lol, but I'm sure if you had a chat with a CNC workshop, or asked on your channel, people would have advice? You have 500k subscribers, someone is definitely going to know what to do.
      @@MamlamboFossils

  • @jemaltedoradze098
    @jemaltedoradze098 6 місяців тому +1

    Technologies Is GREAT THINKS .(You have a Much Progress .) Congratulations !

  • @sueparras6028
    @sueparras6028 7 місяців тому +1

    I love the care you take with the fossils. So much more satisfying than watching someone hit a rock with a hammer and hope for the best. Thanks for all of your hard work, it's appreciated. 👍💯✌🇨🇦♥️

  • @lh3540
    @lh3540 7 місяців тому +1

    This is so cool. Petition to scan the entire Earth. 🦖🦕🦀🐧

  • @patrickmclaren4360
    @patrickmclaren4360 7 місяців тому +1

    That is awesome, thanks for sharing this with us, nothing like the real thing, the 3D modeling is very cool also and you stay safe as well

  • @stitchingshenanigans3917
    @stitchingshenanigans3917 7 місяців тому +1

    This is so fascinating!

  • @Jmashandsprouts
    @Jmashandsprouts 7 місяців тому +1

    Great video!

  • @viridiangreen8259
    @viridiangreen8259 7 місяців тому

    Loved learning about this

  • @julesgosnell9791
    @julesgosnell9791 7 місяців тому +1

    very cool - looks like what is needed is an AI stage to learn to discern matrix from fossil and the production of cheap, home scanning technology...

    • @julesgosnell9791
      @julesgosnell9791 7 місяців тому

      if we had home scanning and you did actually want to prep rather than just print a specimen, you could have a pair of Augmented Reality goggles guide you through the prep work - a bit like they are doing for surgeons...

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      I've played around with that 😄

    • @julesgosnell9791
      @julesgosnell9791 7 місяців тому

      @@MamlamboFossils I remember something you did about training an AI to recognise microfossils ?

  • @mrmullett1067
    @mrmullett1067 7 місяців тому +1

    That is simply amazing.

  • @marymacdonald805
    @marymacdonald805 7 місяців тому +1

    I love science and what technology can do.

  • @MeshFrequency
    @MeshFrequency 7 місяців тому +1

    Magic!

  • @ianmax5263
    @ianmax5263 7 місяців тому +1

    Tech is amazing. Fun video

  • @napalmholocaust9093
    @napalmholocaust9093 7 місяців тому +1

    I have dozens of trilobites in matrix. A print of them with a bit of scaffold connecting them all would be interesting. It is quite soft, specimens including so I've not tried to prepare it.

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      That would be quite cool. You might need a micro CT for something that small.to get the detail

  • @statue98
    @statue98 7 місяців тому +1

    Amazing!

  • @moefuggerr2970
    @moefuggerr2970 7 місяців тому +2

    Cool

  • @chikokishi7030
    @chikokishi7030 7 місяців тому +1

    I also use blender cura and 3dpronting. What printer dyou use?

  • @sandraanderson217
    @sandraanderson217 7 місяців тому +1

    That is so amazing! ❤

  • @josephcormier5974
    @josephcormier5974 7 місяців тому +1

    That's so cool sir thank you for sharing this with us six stars brother

  • @randalljones4370
    @randalljones4370 7 місяців тому

    Just out of curiosity, has Pacific Radiology ever offered the FOV, kVp and mA for their scans?
    (Field of View, kiloVolts(peak), and milliAmps)
    I wonder if I can get an Oral Surgeon colleague to let me run a few scans on their cone-bean machine when they have a day off... possibly.
    I should think about possible skills/equipment-to-trade.

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      Sorry, I don't know the exact settings they used but the technician / dentist will know for sure. It might be a bit of trial and error though.

  • @user-helldogx
    @user-helldogx 7 місяців тому +1

    До чего наука и технологии дошли. Здорово! Спасибо!

  • @samcrane9817
    @samcrane9817 7 місяців тому

    NOW show us the hard work of getting the crab out of the rock!

  • @dominikgietl5670
    @dominikgietl5670 7 місяців тому

    Regarding organ conservation of fossil arthropods: the fossilized specimens are mostly hollow exuviae/moults. Exuviae are moulted over and over again during the lifetime of a single crab. Whereas it is comparatively rare that a crab just dies. Most of the time crabs are killed by predators. A crab killed by a predator is most likely consumed afterwards and doesn't get the chance to fossilize. Whereas exuviae are much more common and much less interesting for predators. Therefore, they fossilize easier. The carapaces of crabs are flipped open during the molting process but they often flip right back into place. Maybe you have noticed this already with recent exuviae on beaches.

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому +1

      I have found moults, they are not as nicely inflated as the ones where the crabs actually died (maybe burrows or big turbidity currents?)

    • @dominikgietl5670
      @dominikgietl5670 7 місяців тому

      @@MamlamboFossils that's also possible and much more likely given that you can differentiate moults from dead crabs. 🙈

  • @EdAtoZ
    @EdAtoZ 7 місяців тому

    When your perpairing the model to print, Why not rotate the model 90 degrees so it sets flat on the base plate and reduce your printing time ?

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      You lose detail and the layer lines are very visible then. You want more layers as that = more detail in my experience

  • @nunyabisnass1141
    @nunyabisnass1141 7 місяців тому

    You know, since it's mostly intact and untouched, you could sell it as diy specimen as well.

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      I don't sell fossils 😀

    • @nunyabisnass1141
      @nunyabisnass1141 7 місяців тому

      @@MamlamboFossils forgive me if you've explained this before, but you have gathered a lot of fossils for a personal collection, unless they're going to a museum.

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      @nunyabisnass1141 I give them away at school visits but I keep them in the country as per the laws

  • @occamsrayzor
    @occamsrayzor 7 місяців тому

    Probably a stupid question , but how did you initially know there was a fossil in it and it wasn't just a pebble? Do you routinely scan them after collection ?

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому +1

      I could see the legs sticking out the side like in this video ua-cam.com/users/shorts6mhX3ttObwU?feature=share

  • @shaunandsqueak
    @shaunandsqueak 7 місяців тому +1

    thats really cool!! I wonder if you could put one on like a printer setup but have it chip away alot of the waste rock for you lol save you alot of time

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      A CNC machine would work!

    • @shaunandsqueak
      @shaunandsqueak 7 місяців тому

      yep that would work well! maybe drill a hole or two on the underneath so you could orientate correctly and hold it firmly...I have some huge concreations from tarawera area state highway 5 one cracked and had freshwater snail shell bout 150mm..if you are ever up these ways i can show you where they are exactly or could probably do by google..figure they were blown out of lake taupo...@@MamlamboFossils

  • @willbejamming1532
    @willbejamming1532 7 місяців тому +1

    Super, man.

  • @marcatteberry1361
    @marcatteberry1361 2 місяці тому

    that was fun

  • @HigeYatsu
    @HigeYatsu 7 місяців тому +1

    This is so cool, haha.

  • @joshwasereyesterday
    @joshwasereyesterday 7 місяців тому +1

    Has this technique been used in the paleontology profession?

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      Yeah, it's used regularly - seeing stomach contents, brain endocasts... so many uses!

  • @dianefiske-foy4717
    @dianefiske-foy4717 7 місяців тому +1

    FASCINATING 👩🏻‍🏫👵🏻🧔‍♂️🦀👏🏻🥰‼️

  • @vebnew
    @vebnew 7 місяців тому

    Will you sell me a printed copy of the crab?

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      You can download it and print it here, there are places online that will print it or some libraries also do it: sketchfab.com/3d-models/large-tumidocarcinus-giganteus-crab-ae84ab9fa4da4f31be107d1f60a84689

  • @miked2125
    @miked2125 7 місяців тому

    how much it cost for this x ray? I have a couole that i need to do. Also, where?

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      This was done as part of their outreach program. You can check with some industrial scanning places, they do it for checking welds

    • @miked2125
      @miked2125 7 місяців тому +1

      Thank you so much for responding to my question. I will definetly look into it. Been watching your channel for 2-3 yrs now. Love it. You do an amazing job. I see how people send you stuff all the time, if i wanted to send you some fossils how would do that? What address do i send to ? Thanks@@MamlamboFossils

    • @miked2125
      @miked2125 7 місяців тому

      Also, i have some pics of fossils i've found on my phone, is there any way i could send them to you so you could give me your thoughts? Thanks

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      @@miked2125 That's very kind of you! My postal address is:
      Morne Mamlambo
      PO Box 78018
      7648
      New Zealand
      But it's super expensive to send things to New Zealand so please don't send anything important or big! A postcard is just as cool to receive!

    • @miked2125
      @miked2125 7 місяців тому

      How about pics? So you'll know whether or not its worth sending. Thanks
      @@MamlamboFossils

  • @suerobertson5132
    @suerobertson5132 7 місяців тому +1

    brilliant SO interesting 🐨🐨🦘🦘

  • @protoguy
    @protoguy 7 місяців тому

    Not Xray then?

  • @timmienorrie
    @timmienorrie 7 місяців тому +1

    🦀🦀🦀🦀🦀

  • @jemaltedoradze098
    @jemaltedoradze098 6 місяців тому

    Is handmake anological ?

  • @jemaltedoradze098
    @jemaltedoradze098 7 місяців тому

    Computers and 3d printers is good , but is not news .Do You Open it ( stone ) ?( для сравнения результатов , как исследователю - не интересно ?) . This is more interesting , I think .Perfect! .

  • @sandmaker
    @sandmaker 7 місяців тому +2

    what could be more cool! Thanks for sharing. Gobsmacked!

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      I'm glad you enjoyed it! Thanks so much for watching!

  • @JacquelineNelson-c4n
    @JacquelineNelson-c4n 7 місяців тому

    One question why is everything found in sedimentary rock. There is profound evidence. All over the world. The Bible talks about a global. Flood that happened to the earth. I now it tends to to confound the science community. I used to be an evolutionist. Now I am not. But I’m not eregunt. Lemay

    • @MamlamboFossils
      @MamlamboFossils  7 місяців тому

      When you see rivers full of mud going into the ocean, that is sediment which covers some dead animals and some of those will become fossils. Metamorphic rock destroys fossils or makes them difficult to recognise. Volcanic rock usually burns the fossils so they aren't preserved (lava flow) but sometimes you find them in volcanic rock, just very rarely.