All About Geodes and How They Are Formed

The formation of geodes is one of the world's oldest and coolest natural formations! This week, Natalie gives a step-by-step look into how geodes are formed and how they get their unique characteristics.
For more info on Amethyst: www.jtv.com/library/amethyst-...
For more info on Agate: www.jtv.com/library/agate-fac...
Subscribe to #JTV: www.bit.ly/subscribejtv
Check out JTV's Gemopedia: www.jtv.com/library/gemopedia
JTV is one of the leading experts on gemstones and is the best source on KZbin for all things gem related. Featuring gem history, the science behind the stones, gemstones in pop culture, and much more, you too can become a gem expert by immersing yourself in JTV’s channel. Natalie, our host, is a Graduate Gemologist and an Applied Jewelry Professional.
Website: www.jtv.com/gemstones
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Twitter: / jewelry
Instagram: / jtvgems
Sisk Gemology Reference: www.jtv.com/sisk-gemology-refe...
#Geode

[@rubik8529]

Who all came here after seeing amethyst geode opening video

[@x0o0ox_]

Me

[@elbart8016]

👋

[@nnprsl]

Me! 🤣

[@kevinsamaroo6252]

Lmfao me 😂

[@jonmacdonald5345]

Me I thought the chain was going to break

[@Lew114]

We gave our kids a couple of small geodes for Christmas. They just cracked them open and were amazed. Thanks for making this video to help explain!

[@caitlin5770]

When youtube teaches you more than science class....😂😂

[@applepen7727]

Dreambeam I know right

[@applepen7727]

I don’t know why teachers think it bad.....

[@caitlin5770]

PrincessUni965 YT I know! I had a test in biology and the first part was seed germination. Like a WHOLE page! How will that help? Can't we learn about gems instead of gas exchange? Nope I have to learn off the "useless time-wasting" website :/

[@applepen7727]

Dreambeam yup

[@nethangarvey1293]

@Seth Ellison that's exactly right. That's why we should become communist, becuase you can't be a slave if you've already starved to death.

[@Intrafacial86]

So, when a breaking open a geode in Stardew Valley reveals a thunder egg, it’s a lie? My disappointment is immeasurable and my day is ruined.

[@macshaneeee]

I specifically searched for this video because of Stardew valley 😂

[@Insanegameelaine]

Yes, in fact I did happen to form in mineral deposits seeping into a porous rock cavity formed by co2 gas trapped inside molten rock! Thank you for asking!

[@dudoklasovity2093]

me too! but she isn’t the fortunate one. boo-hoo!

[@danielrosales5968]

Best explanation ever with the most enthusiastic and clear information. Gray job!!

[@-Slinger-]

I'm not a geode yet, but I àm full of hot air.

[@tobymcgroby8967]

2:55 That was adorable!😍😍👏👏

[@sidewaysofieo5149]

I have to write a narrative story about a rock. I got an amethyst and so here I am doing my research, my teacher better be ready for a heart wrenching story with a rollercoaster of emotions.

[@Rookie_Rockounding]

Great explanation!!!! Brilliant video!!!! Thank you!!!

[@gems]

Thank you!!

[@smoreschnapps8868]

I really love the enthusiasm you have for rocks it definitely makes your videos enjoyable. I hope you keep making more! I do want to help out with some of the facts/science you talk about in this video in an effort to make things more accurate and a bit less confusing. One thing was the discussion of how geodes form in lavas. It was a good description of how geodes can form in basalt and andesite (two different types of lava), but it isn't how geodes form in rhyolitic lava. Another thing was how you said quartz crystals are generally found in igneous rocks whereas silica is found in sedimentary rocks. You sort of treat silica as different from quartz, but quartz is made of silica (silica = silicon + dioxide). Also, quartz crystals are one of the most common crystalline structures found in geodes from sedimentary rocks with good examples being Keokuk Geodes and Moroccan Geodes. Finally, you talk about how a geode is different from a thunderegg. The explanation for how a thunderegg forms wasn't very accurate and the whole "geode vs thunderegg" thing really confuses the relationship between the two. A thunderegg is a specific type of rock whereas a geode is a feature that any type of rock can have, that feature being a hollow interior lined with crystals. Whether the inside of a thunderegg is solid or hollow doesn't change the fact that it's still a thunderegg, so a thunderegg with a crystal-lined hollow interior is a thunderegg that's also a geode. This happens with septarians too. Most septarians (a specific type of rock that forms in sedimentary formations) are completely solid on the inside but some can develop hollow interiors lined with calcite crystals. Paul Colburn wrote a really great book on thundereggs and his theory on how they form. He spent decades digging thundereggs from locations across the western US and has done more to advance our knowledge of thundereggs than anyone else. I would suggest checking it out if you can, it will help with understanding thunderegg formation and also why it's inaccurate to focus on the "geode vs thunderegg" comparison.

[@m.panieerselvam8894]

KZbin have the sweetest teachers ... 🌷😘

[@thammer302]

This is a superb explanation, much better than Wikipedia’s article on geodes. I really liked the explanation of how the mineral-laden solution enters the hollow portion to deposit the minerals and form crystals.

[@mayurarun]

This is so great. Quality of this one is top notch.

[@gems]

Thank you!!

[@LandO73420]

So in 5 grade science we just learned about geodes and now I have a big thing for gems. We watched this vid in science that day.

[@matthewmccabe2835]

Once I saw a piece of pure raw iron, that’s when my rock fanatic mind started to kick in.

[@nancyblair9862]

Best info. ever! Great job!👏👏👏👏👏👏👏👏👏

[@LiveHappy76]

Just stumbled onto and subbed to your channel. Amazing natural beauty every frame of this video! 😍 Cracked a first geode this year!

[@richbulthuis7175]

Cool stuff, I always wonderd how amethyst was made, thanks for sharing your knowledge, keep rockin on.😎👍

[@rebeccapower9226]

I found this very fascinating

[@analuciadehoyosmarquez9789]

This is so interesting!

[@jeffreystiltner5796]

I love this video mainly because I'm a science freak and I absolutely love anything like this I have a collection of colored Rock's and I own a bunch of sea shells and 3 geodes and my grandpa used to work in the mines so he has a geode he found himself and a small bag of minerals and and other things he got in the mines and I absolutely love it ❤️ I give this video a 👍🏽

[@moriscoley5328]

I was just curious about how geodes were made. This video was very informative and I have subscribed. Thank you.

[@062241kdp]

I think I am in love! Thanks for the video, too.

[@MP3Martin]

I love this update

[@minimewy4310]

My love for minerals started when I was 9 and my teacher mentioned quartz. My only friend was ill that week so I spent recess looking at different rocks, trying to find some. I read a book on geology, I bought crystals everywhere I could and on a field trip to a museum with a geology room I took several hundred pictures. I stopped obsessing for a while but now it's even worse than before thanks to these videos...

[@gems]

That's incredible! Glad we could help re-spark your interest/love for geology!

[@brianaseda1716]

this is going to help me with my science project and the science fair

[@MrCatwalkonramp]

Well she might not be a geode. But she's definitely a gem.

[@MomoTheFfidyll]

We went on a class field trip to a museum, and it had plenty of these pretty stones. I saw a basket of them at the gift shop and just had to have one. I've never seen one up close before!! They are my favorite stones ever

[@wa4aos]

Very well done..Thanks

[@choco.truffles163]

I already saw one..in the mall with a purple shiny stones inside..its really beautiful😊

[@Juan-qz4eg]

The purple gems inside is amethyst and rarer than the normal white and clear geodes

[@AlottaBoulchit]

I remember watching a show on the science channel about that one cave full of ridiculously giant crystals once. I was fascinated (yet terrified...cave phobia) by that place so i was researching it and read someone call that place a giant geode. WOULD that giant crystal cave be considered a geode? It would also be cool if you could do a video on that subject sometime!

[@GeologyofGemsMinerals]

The Naica gypsum crystal caves are considered vugs, not geodes.

[@AlottaBoulchit]

Geology of Gems & Minerals oh wow ! what's the difference between vugs and geodes? :0!!

[@GeologyofGemsMinerals]

Geodes are a secondary feature (not formed at the same time as the host rock) and typically have a tough exterior "rind," even in the case of Brazil and Uruguay. Basically, you'll get a massive layer of a mineral or mineraloid (quartz, agate, ...) completely enclosing a void. A nodule, or in the case of agate a thunderegg, is similar but completely infilled. A vug is any open space in rock containing crystals; they can be primary or secondary.

[@AlottaBoulchit]

Geology of Gems & Minerals Oh wow! Thanks for explaining that! Rocks, crystals and gems are so fascinating!😍

[@kfl611]

And that cave was rather deep under ground too, not like you could get scared and just turn around and run out. ha ha ha.

[@kmc55]

I love the Geode area rugs by Safavieh I saw at Lowe's The designs are so beautiful and unique. Getting an 8×10 rug for the living room.

[@jrambo7495]

Now I'm intrigued!! Google here I come!

[@ipekkomurcu]

It' fascinating!!

[@saraadams1391]

Great video! You go girl!

[@gems]

Thank you!

[@natking1u1z99]

Any recommendations for purchasing good quality geods?

[@_puzzled]

LIKE! Agreement. All About Geodes and How They Are Formed is a very educational (watch many times) video.

[@Lil-Dragon]

Wish I had a gemstone collection but my video game and book obsession doesn't come cheap. They are all stunning though.

[@chakibizeboudjene1]

same XD

[@gitanjalitiwari9407]

I understood every single thing , I have to make a ppt on this and I am sure everyone will love my ppt in school

[@PH_navyist76]

I seen a geode but its small but nice and thats how it forms. Thx for the info

[@Isaiah_Lopez]

This is good for my project

[@marshall1416]

Earth is so fascinating

[@MsHollylove]

You're great!!

[@KevinP32270]

FREAKING EPIC.

[@taracraig6206]

Wow! That is cool.

[@manofthetombs]

On a totally different subject ... she is absolutely beautiful in form and face!

[@michaelenochs4033]

Without sounding thirsty, I agree.

[@marcoscollett9940]

Wow she is the most beautiful + maybe like a human geode

[@billjamal4764]

Bruh

[@hydrobyte4844]

@@billjamal4764 LETS CUT EM OPEN HEHEHE

[@dpm377]

I find some nice geodes around where I live. I found a whole one in a rock and cut it out with a grinder, then cut it in half and it has blue-grey layering with a small cluster of glass-clear crystals at the center. The outer shell is very rough and abrasive to the touch, would make a good pumice stone. I have also found fragments of red-white and green-white geodes.

[@sayvilletech9135]

While I did not quite get everything in the video, I really liked it.

[@vm.999]

Liked and subscribed!

[@scottowens940]

You are a goofball 😉 and informed and articulate. And a goofball 😀 love it! Thanks

[@MrSenset]

I know all about gems. I just watched a 4 minute and 46 second video that was hosted by one. 8-)

[@Crackhouts]

And coin collecting. Learned it from a fine dime.

[@Despotic_Waffle]

Simp

[@madisonbrown8851]

@@Despotic_Waffle incorrect usage

[@xavielho]

I wish my teachers were like her

[@cesarrobledo2583]

It’s 3am and I don’t know I ended up watching videos about geodes for over an hour.

[@snail9552]

I needed this to find out if i can find crystals in baishawan!

[@ninjahombrepalito1721]

My interest in rocks and gems started with diamonds being the hardest material. And other crystals and fantasy. Btw, you look good with a hat on.

[@juliajean6731]

lol for drNozman (i'm french and when i saw his background I was like :wait rewind that a bit)

[@echosart8552]

julien jean me too!!

[@AngelasMixedMediaArtist]

Thx

[@johnsopko2118]

Great vid but at times the music was kinda loud I couldn't hear everything you said

[@gusgreenwalt2007]

thank you for the video i really like the purple ones it was pretty then the other ones are very pretty to

[@a.hildenbrand1014]

The amethyst?

[@alexanderzangal4125]

Please make a video on alexandrite Or blue amber Or Maybe calcopyrite Plz ^-^

[@GeologyofGemsMinerals]

In terms of geode formation, it is not true that it's more likely to get Qtz crystals in igneous rock and microcrystalline silica in sedimentary rocks. Also, only the Brazilian deposit has amethyst geodes. The other localities mentioned did not form in the same way (the amethyst did not form in secondary features like geodes, but in vugs).

[@MsButterflysting]

Geology of Gems & Minerals should I enter my "be gneiss" joke here, or above?

[@GeologyofGemsMinerals]

MsButterFlySting80 I don't understand how this relates to my comment.

[@MsButterflysting]

Geology of Gems & Minerals oh nothing really, it's the name of a formation I learned from some other KZbin video on geology, rock formations & minerals. He had called it "Gneiss" pronounced as in the word nice. To be clear, I'm not disagreeing with you at all, nor was I being mean, so please take no offense. Sarcasm doesn't bode well with the comments on this very well for me does it? Actually, it may not have even been sarcasm, but rather a pun. A very dry pun intended joke. I should just delete it. Sorry!

[@GeologyofGemsMinerals]

No offense taken just wasn't sure what you meant in the context. :-) I am familiar with the pun.

[@alfenito]

Thanks. Now I don't have to write this comment. I figure she meant that calcium based crystals are more likely in sedimentary geodes.

[@nhevaranza5679]

Wooow that is the most beautiful thing i've ever seen 😍😍😍

[@johnnieabney2560]

Have some of these

[@milesnn]

Awesome awesome

[@21dahlgaardcarrie]

"Raspberry Baret" 😂✌💜

[@jmoney7289]

Carrie Haines my favorite part I'm going to move my dog's lips and say it when I get home so they look like they're singing it lol

[@bunnycow3043]

I don't even watch anything about rocks and somehow watching simplenailogy I got here.

[@pattik172]

I agree! Dreambeam

[@FlyToTheRain]

state rock of Iowa!

[@AlottaBoulchit]

It would have been cool if you could have told us ways to spot geodes in the wild!

[@petro062]

The just look like a ball or a rock egg. Once you start finding them you get to recognize the way the outer surface looks. Take a hammer with you and always where glasses when you hit a rock.

[@fernandoazeredo1388]

the background music lowkey slaps

[@lilkittrnqwr3094]

I found one of these !! huh

[@Snarkythecat]

1:28 *A NEW HAND TOUCHES THE BEACON*

[@kalumarjuna80]

Thanks but I can't remember anything you said.... was just looking at the beauty of you!!!

[@bresmilez6857]

You had me and my daughter at Raspberry Beret. #RIPPrince

[@lkop09nowbterp]

You didn't address the formation of Keokuk Geodes.

[@userwl2850]

Her top fits perfectly.

[@deomsh]

Its just a video about rocks dude come on

[@williambtm1]

Hi there JTV, I like people that know what they are talking about. I like yourself have an inquiring mind and the special ability to reason or concentrate on the available relativities to enable geological formations. Although my deeper interest lays in orogenesis, the formation of mountains.

[@jrambo7495]

She reading off of cue cards, you maroon!! She didn't do anything but copy and paste some information off of Google and read it to us.

[@williambtm1]

@@jrambo7495 I agree with you, I learned my expansive knowledge all about geology, by reading, and by studying, out in the field of Rocky cliffs and the cavities found in Granite, especially in areas where Granite has obtruded to the surface. One can learn that the indicator of a vug (a cavity formed in the massive form in the Granite itself by the extra-sized grains in a confined area, crAck it open with decent and occasionally heavy hammers and the utilizing of hardened Steel chisels and or sharp-pointed heavy-duty spikes. But... one must always wear eye protection when banging about and capering about like a madman. In the right petrologic environment, I get a warm feeling in my stomach. (Petrology; the study of rocks.) Cheers old mate.

[@jac4YouTube]

being born in the womb of my mother, not sure what kind of minerals surrounded me but I know we all have minute minerals inside of each of us, iron, magnesium etc. literally we are formed from the dust of the earth as it states in Genesis.

[@nightingale2710]

That is beautiful. Thank you

[@terrencepeterson9669]

the singing part was so cute

[@ivetaholden4618]

cool

[@d.b.1176]

Can you please turn the music up?

[@sdwlmkcgarou]

Teacher: Today we are going to learn about how geode amethyst are formed. Kids who played minecraft for 13 years:

[@jmoney7289]

I loved the raspberry Beret skit more than you could ever know

[@tobymcgroby8967]

She was so cute haha... I'm supposed to be a grown man & never admit when something is cute, but come on... She hesitantly sang Prince like a shy girl, irresistible

[@infinityquartz4744]

Maybe you can do something that shows differences between lab created and naturally grown diamonds (if any)

[@jessedover6175]

Do you find many where you live?

[@s0meon3onyt6]

My geode has both agate and amethyst

[@paulkimkyan]

I have a geode and find then at whakatane river side drive

[@user-bn2ed6qk6e]

I want to be a aerialists is that how u spell. It?

[@aightbet1471]

*me over here with a mineral that has other mineral stuck together in one in my right hand as i watch*

[@drinny26]

I have a huge glacial erratic boulder in my yard. Is there anything inside it?

[@lordfarquar9215]

Love the video. Please dont bash wonderballs. They were my best friend when i had no one.

[@shahshah-wt2tn]

There are 2 very rare gems in the video 8 , I have only focus on them 2 gems

[@dr.evrimkaradag3317]

alternative title: How mini-kindergartens are formed

[@liliu6090]

When I was 7, I cracked open a rock and found a geode, but....I didn't know you could sell them and get at least $100(it was big)

[@chrisdaniels4674]

I have a question. Where do the rocks come from?

[@snail9552]

Lava/magma

[@Eildre]

What about that good ol' Rutile?

[@nategriepentrog4662]

I have a mine in my yard and I found a tiny geode

[@louiebaron1574]

Meron aq San ba powide ko ibinta

[@Rush1017]

2:40 Excuse me miss, but quartz is silica...

[@nerdygirlygirl8750]

I actually dug up an amythest geod once