5 Kinds of Glass Made by Nature

Рет қаралды 510,210

4 жыл бұрын

Did you know that glass can be made in nature? In this episode of SciShow, Michael Aranda shows you 5 types of amazing glass naturally produced in nature. Let's go!
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Sources:
flexiblelearning.auckland.ac.nz/rocks_minerals/rocks/index.html
www.britannica.com/science/obsidian
www.sciencedirect.com/science/article/pii/0022309375901209
volcano.oregonstate.edu/book/export/html/205
www.mindat.org/min-8520.html
www.sandatlas.org/volcanic-glass/
www.mindat.org/min-3004.html
pubs.geoscienceworld.org/msa/ammin/article-abstract/93/11-12/1865/44683/common-gem-opal-an-investigation-of-micro-to-nano?redirectedFrom=PDF
pubsapp.acs.org/cen/whatstuff/stuff/8104sci3.html
australianmuseum.net.au/learn/minerals/gemstones/opal/
www.mindat.org/min-32187.html
www.ga.gov.au/education/classroom-resources/minerals-energy/australian-mineral-facts/opal
cosmosmagazine.com/space/opal-found-in-antarctic-meteorite
australianmuseum.net.au/learn/minerals/shaping-earth/tektites/
www.britannica.com/science/tektite
www.jsg.utexas.edu/npl/outreach/tektites/
ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19750015372.pdf
oumnh.ox.ac.uk/fulgurites
www.usfcam.usf.edu/cam/exhibitions/1998_12_McCollum/supplemental_didactics/47.Petrified.pdf
link.springer.com/article/10.1007%2Fs00410-012-0753-5
www.mindat.org/min-2363.html
blogs.discovermagazine.com/but-not-simpler/tag/fulgurite/
glassspongereefs.com/the-discovery/
oceanservice.noaa.gov/facts/glass-sponge.html
docs.niwa.co.nz/library/public/NBM-124.pdf
www.ncbi.nlm.nih.gov/pubmed/21680406
www.mpg.de/5595233/climate_archive_deep-sea_sponge
australianmuseum.net.au/learn/animals/sea-stars/sponges/invertebrates-collection-deepsea-glass-sponge/
Image Sources:
www.videoblocks.com/video/semiprecious-stones-euy9kmpolijrviv3d
commons.wikimedia.org/wiki/Category:Obsidian#/media/File:13_years_of_Russian_Wikinews_in_Moscow_21.jpg
commons.wikimedia.org/wiki/Category:Obsidian#/media/File:Glass_Mountain_in_northern_California_in_summer_2012_(15).JPG
commons.wikimedia.org/wiki/Category:Snowflake_obsidian#/media/File:Snowflake_Obsidian441.jpg
www.istockphoto.com/photo/lava-gm155375562-19741844
commons.wikimedia.org/wiki/File:Opal_Welo_-_Welo,_Afar_Province,_Etiopia,_Afryka..jpg
www.videoblocks.com/video/ripples-on-the-water-close-up-hrjvwkr
www.flickr.com/photos/jsjgeology/29885687305/in/photolist-oTFG2S-paUhve-pb8Fpf-2eMiXq1-8FpLeH-oWjT8z-pbNjqs-oTFujd-2eA7tuR-C9iBux-paU4Bi-p98HaA-24Wa8Qc-UpyxVY-MwTXCM-TqdxZi-MmYqAy-Mw1Dfs
commons.wikimedia.org/wiki/File:Indochinite.jpg
www.istockphoto.com/photo/lunar-crater-surface-texture-backdrop-gm957057906-261324105
www.istockphoto.com/vector/earth-from-space-with-moon-and-rocket-gm831703660-135365579
www.istockphoto.com/photo/watercolor-vintage-world-map-in-green-colors-gm1043715014-279376499
en.wikipedia.org/wiki/Moldavite#/media/File:Moldavite_No.2.jpg
en.wikipedia.org/wiki/Australite#/media/File:Australite_back_obl.jpg
en.wikipedia.org/wiki/Philippinite#/media/File:Philippinite.jpg
en.wikipedia.org/wiki/Fulgurite#/media/File:Fulgurite1.jpg
commons.wikimedia.org/wiki/File:Fulgurites-algeria.jpg
en.wikipedia.org/wiki/Fulgurite#/media/File:Fulgurite.JPG
commons.wikimedia.org/wiki/Category:Fulgurites#/media/File:Type_IV_rock_fulgurite_2.jpg
en.wikipedia.org/wiki/Fulgurite#/media/File:Fulgurite_at_Rice_NW_Museum_-_Hillsboro,_Oregon.JPG
commons.wikimedia.org/wiki/File:Type_II-III_fulgurite,_Ann_Arbor,_MI.jpg
en.wikipedia.org/wiki/Hexactinellid#/media/File:SpongeXenophorid.jpg
commons.wikimedia.org/wiki/File:Expl6627_(9734259269).jpg
commons.wikimedia.org/wiki/File:Expn4384_(27840605922).jpg
www.istockphoto.com/photo/computer-classroom-gm506889946-84447115

Пікірлер: 474

@SciShow 4 жыл бұрын

Geography fail! In the section on moldavite, the star on the map is over Moldova. It should actually be over the Moldau River in the Czech Republic.

@fomalhaut_the_great 4 жыл бұрын

I noticed. Thank you for correcting it.

@fomalhaut_the_great 4 жыл бұрын

@Home Love Uploaders can pin comments to the top, either others' or their own.

@GodBoredWas 4 жыл бұрын

I wish you would stop "Powerpoint Slide"ing your videos. When you post the words you are saying as part of your video... and then say those words, its redundant. If I wanted to turn on Closed Captioning, I'd do that. Rendering the words and then reading those words is useless. I'm in meetings all day and when a person is saying the exact words that are on the screen as the words are on the screen is terrible. Stop the Powerpoint Slide Video style. PS: i like the content and the presenter, just not the delivery method.

@ResortDog 4 жыл бұрын

The Virgin Valley Opal Mining District in Nevada has Black Precious Opal fossils too. Usually Twigs, like this one: kzfaq.info/get/bejne/r6eYoKWfu7Wqfnk.html , to trees and rocks, but also animal bones and casts. I also have a Facebook Group for Swordfish Mining about the valley and its mines and gems. You can even pay some owners to mine their claims. (How about the little glass beads without any inclusions in the ice cores?)

@boblangford81 4 жыл бұрын

Nerd alert! Just messing with u...

@Zackfish12345 4 жыл бұрын

The one thing this channel lacks is more visuals for the things they’re discussing. Sometimes what they’re talking about would be awesome to see, but all we get is text on the screen of exactly what they’re saying. I think adding more images or even video clips of what you’re talking about would take these videos to the next level!

@lancewedor5306 Жыл бұрын

I think this a major flaw with the presentations. I can hear what they say, so amplify the topic with visuals that are pertinent.

@K_i_t_t_y84 4 жыл бұрын

PLEASE do a whole episode about those cool glass sponges!!!!

@emilylegan3068 4 жыл бұрын

@lyreparadox 4 жыл бұрын

@mcknorth 4 жыл бұрын

@The-pf4zy 4 жыл бұрын

@liammargetts 4 жыл бұрын

@f1guy25 4 жыл бұрын

So Minecraft lied to us. You have to remove water from lava to get obsidian.

@3mar00ss6 4 жыл бұрын

it kind of didn't at the same time you need to cool lava fast to get a glassy structure

@jasper3706 4 жыл бұрын

Also obsidian isn't really hard to break, it shatters pretty easily

@midnightgear2616 4 жыл бұрын

However it does have the sharpest edge known to man.

@Gryphonzwing 4 жыл бұрын

@@jasper3706 I think their just being super careful so they don't shatter it. That is my reason for why it takes so long to break in Minecraft.

@TGears314 4 жыл бұрын

Midnight Gear natural edge

@xck 4 жыл бұрын

1: Obsidian (0:53) 2: Opal (2:13) 3: Tektites (4:33) 4: Fulgurite (6:23) 5: Glass Sponges (8:03)

@gryphonshire 4 жыл бұрын

They left out "Trinitite" which is the green glass formed from the test of the first Atomic Bomb at Trinity Site, (north of Alamogordo), New Mexico.

@baterdenegantulga4776 4 жыл бұрын

@@gryphonshire Because that's not natural.

@aaronh1372 3 жыл бұрын

Gadget wasn't natural?! Hmm..

@gigglysamentz2021 4 жыл бұрын

7:12 Wow! Making metallic iron by giving electrons from a lightning strike is seriously cool! XD

@Kimbalhota 4 жыл бұрын

@Nathan work's Was looking for that comment!

@CanuckMonkey13 4 жыл бұрын

My first thought on hearing about the glass sponges: I DESPERATELY WANT ONE OF THESE IN MY HOME! My second thought: ...and it is all the people thinking like me who make such wonders endangered or extinct in nature. I'M A MONSTER.

@caramelapple5562 3 жыл бұрын

you're not a monster, the fact that you thought twice about it shows you care about endangered species

@vangu2918 3 жыл бұрын

Only if you actually do it.

@SephirothRyu 2 жыл бұрын

I like that they are basically able to "domesticate" crabs.

@erinmac4750 Жыл бұрын

@@SephirothRyu I hadn't heard about that, but there is a guy on YT who rescued a lobster from the "selection" tank. The lobster seemed to be pretty chill. 🦞

@caroljo420 Жыл бұрын

Fun fact: One thing many people don't realize is that if you're wearing an opal ring, and you reach into a freezer, your opal can break, and sometimes even shatter. That's because of the water in them. Water expands when frozen. Opals are very fragile.

@Naruya23 4 жыл бұрын

Your voice is so soothing. I've been having a lot of difficulties with my mental health lately, which makes it harder for me to sleep, and this video is helping (that's not me saying it's boring, because I do find the topic of gems fascinating, but because your voice is so relaxing, it's helping me calm down). Thank you.

@TheDevler23 4 жыл бұрын

opalized fossils are probably my favorite natural occuring objects!

@virglibrsaglove 3 жыл бұрын

Mine, too! They combine to of my major interests! Plus, they're just darned beautiful!

@sebastianelytron8450 4 жыл бұрын

Did you hear about the guy who put root beer in a square glass? He made beer.

@scottwalton6026 4 жыл бұрын

Wow......that's fucn good

@daedae3117 4 жыл бұрын

Wat

@FREEGEMS 4 жыл бұрын

Dae Dae math joke

@dejayrezme8617 4 жыл бұрын

Haha nice! So what do you get when you put a strawberry in a round glass? Strawberry pie? :D

@THETRIVIALTHINGS 4 жыл бұрын

lol

@purplealice 4 жыл бұрын

Let's raise a glass to glass!

@andreaallies7145 3 жыл бұрын

I like the play on words.

@purplealice 3 жыл бұрын

@@andreaallies7145 Thank you!

@wolfboyft 3 жыл бұрын

*earthbends obsidian into the air*

@ideoformsun5806 4 жыл бұрын

I've always loved opals. I'm glad they reached this list.

@listentomerantaboutuseless34 4 жыл бұрын

This is a great video! it reminds me of the time hurricane sandy hit my state, during the clean up some (idiot) guy tried to cut off a branch that was leaning on a live power line and ended up severing the line itself. when it hit the pavement it melted the asphalt and now I have small pieces of asphalt glass that was left over after it was safe to go near it.

@acidsteve9837 4 жыл бұрын

an 8 story high glass sponge? picture please

@DreadX10 4 жыл бұрын

Yeah, so far, I only heard 1 story about them. Where are the other seven? And in which one does the sponge get high (and on what exactly) ?

@acidsteve9837 4 жыл бұрын

@@DreadX10 haha

@davidp.5598 4 жыл бұрын

I would LOVE to see a pic also!

@route2666 4 жыл бұрын

Talking about glass, could you guys talk about trinitite (nuclear glass made after the trinity nuclear tests) minerals like chernobylite and the potential for nuclear waste containment by using glass/making more inert glasses? I've watched nearly all of sci-show's episodes and love your channel. Thank you for all you guys do to bring science to the masses!

@1TakoyakiStore 4 жыл бұрын

When you said living glass I immediately thought of diatoms.

@jasper3706 4 жыл бұрын

Apparently they're crystalline

@1TakoyakiStore 4 жыл бұрын

@@jasper3706 If you watched Into The Microverse's episode on diatoms Hank Green referred to them as basically living glass.

@fredgotpub871 4 жыл бұрын

And me of X-men

@BranDenhauer 4 жыл бұрын

I saw a meme with this guy that said "If the year 2005 was a person" and now I can't get it out of my head.

@friendlyneighborhoodcrackh6059 4 жыл бұрын

Celephaith he looks like every punk rock frontman ever lmao

@sbomorse 4 жыл бұрын

I love opals, never knew how they were created though. I learn something new with every video they upload, this is such a fascinating channel.

@reedkellner6447 4 жыл бұрын

Man, Michael--your delivery is so good in this. This isn't normally a topic I would be terribly interested in, but the way you spoke about it really let me follow along and absorb the knowledge. You were giving me shades of Levar Burton and other classic knowledge-presenters...of course with your own Michael Aranda flavor, too...it was really good.

@RickySTT 4 жыл бұрын

5:37 The moldavite inset doesn’t point to the Czech Republic; it points to somewhere between Odessa and Moldova.

@austinfernando8406 4 жыл бұрын

i thought they'd mention diatoms (single cell alge with glass bodies instead of cell walls).

@TJStellmach 4 жыл бұрын

Are diatom cell walls amorphous silica (glass) or crystalline?

@austinfernando8406 4 жыл бұрын

@@TJStellmach I just looked it up, they seem to be crystalline , so not technically glass link.springer.com/article/10.1007/BF03051518

@jasper3706 4 жыл бұрын

@@austinfernando8406 Honestly having a crystal body is significantly cooler than having a glass body

@frogstereighteeng5499 4 жыл бұрын

Another thing cool about diatoms is that the silica is a major ingredient in sea foam.

@jpe1 4 жыл бұрын

frogster eighteeng does foam on freshwater lakes also contain diatoms? I have noticed that, on the small lake in NE PA where I live, different times of the year will have (slightly) different foam form when strong winds blow, but I never gave it enough thought to try to look anything up, but seeing your comment piques my curiosity, and different diatom growth at different times of the year could explain it.

@virglibrsaglove 3 жыл бұрын

Has anyone else noticed that Michael never stumbles over his words? Like, ever. I don't know how he manages this. I would never be able to read a script so perfectly. 👍

@MrARock001 4 жыл бұрын

This is fascinating stuff! We really need a Crash Course: Geology to bring all these Earth Science topics and systems together!

@thefeatheredfrontiersman8135 4 жыл бұрын

I'm a flintnapper. Thank you so so much for finally talking about opal! I have been waiting for this video since the opal found me. Yep it found me.

@complex314i 4 жыл бұрын

So Tektites aren't huge red and blue cyclopean bugs with only 4 legs.

@K_i_t_t_y84 4 жыл бұрын

😂😂

@TGears314 4 жыл бұрын

Undefind I feel like that will go over a lot of heads but those who get it have my respect hahaha

@javelincheshire6358 4 жыл бұрын

I am very proud to say I understood that reference.

@buelph5742 4 жыл бұрын

@@javelincheshire6358 had to search the comments just for that reason 😂👍👏

@complex314i 4 жыл бұрын

@Peter Connell Tektites are the red and blue bugs with 1 eye and 4 legs in legend of zelda games.

@nulllex0099 4 жыл бұрын

Are you bloody joking? Glass sponges. That's so alien-sounding, it's amazing.

@angelvalencia6782 4 жыл бұрын

When you said natural glasses I was thinking of gorilla wearing wood framed glasses with water as the lenses but this is also good

@xenos_n. 4 жыл бұрын

We found the stoner.

@cleverusernamenexttime2779 3 жыл бұрын

What?

@cleverusernamenexttime2779 3 жыл бұрын

Thanks, now I can't stop thinking about that.

@SciShow 4 жыл бұрын

Go to Brilliant.org/SciShow to try out Brilliant’s Daily Challenges. The first 200 subscribers get 20% off an annual Premium subscription.

@bahaloola 4 жыл бұрын

"Daily challenges that are posted every day" scriptwriters need more coffee

@hunterjackson802 4 жыл бұрын

Im so glad you guys mention fulgurite, i have seen some at the silver lake sand dunes in Michigan. Its pretty rare and to see it was awesome.

@you1027 3 жыл бұрын

A single-cell glass sponge can be... 8 stories tall? That's a mind blower.

@MegaPompoen 4 жыл бұрын

Dr.Stone: "The first man-made material in history, synthesized using science: Glass" SciShow: "I'm gonna end this man's whole career"

@gigglysamentz2021 4 жыл бұрын

So many mindblowing things I had never heard about!

@WonderMagician 4 жыл бұрын

Thanks for sharing your knowledge of these little know natural phenomena.. they are indeed reflective of the ease with which nature creates it's wonders. your enthusiastic presentation was fun and engaging.

@sls8830 4 жыл бұрын

The glass sponges sounds like that Star Trek episode!

@IceMetalPunk 4 жыл бұрын

I remember in my first year of college, my bio professor brought in one of those basket sponges to pass around. I was amazed; until then, I always thought of glass as something man-made. They're really cool!

@Eddy-dn1jx 4 жыл бұрын

That opalized fossil is dope

@greensteve9307 4 жыл бұрын

Australia FTW! :)

@Tbehartoo 4 жыл бұрын

This is really cool! Thanks for sharing it

@RybackTV 4 жыл бұрын

Beautiful stones.

@derickviana9831 4 жыл бұрын

Thx for the amazing content!

@MatthewBishop64 4 жыл бұрын

What a great episode. Fascinating stuff.

@gigglysamentz2021 4 жыл бұрын

I like when you dive deeper into a topic! :D

@solverfix 4 ай бұрын

This is one of the most concise and succinct descriptions of SiO2 natural glasses. Thank you, I really enjoyed this video. Some less common types of volcanic glass are of a mafic nature known as Sideromelane & Tachylite. If there are other glass nerds out there let me know if you know of other natural glasses out there.

@Restilia_ch 4 жыл бұрын

I knew about two of these. Was really surprised by the glass sponges though. Damn nature, you got some crazy ideas!

@anthonyjannini7069 4 жыл бұрын

YYOOO it's been a while since I watched one of these, but my boy Michael done bulked up!! #GAINZ BRO!!

@VandrefalkTV 4 жыл бұрын

Inkstones of the Thundergods! New band name right there!

@The8Disciples 4 жыл бұрын

Knowledge is Power!!!!!! Unliiiiiimeted Power!!!!!!!!

@gabribotha2403 Жыл бұрын

I looooooove SciShow!

@gigglysamentz2021 4 жыл бұрын

So many interesting thing in there!

@Srinathji_Das Жыл бұрын

Awesome video! 👍

@jornadaclassica1160 2 жыл бұрын

amazing job!

@deshanfernando7982 4 жыл бұрын

That was a rocking video!

@ticklemyheart44 4 жыл бұрын

This is so cool! :D

@GHutchOrgan 3 жыл бұрын

Really good presenter, nicely paced delivery. Well done

@DailyHotTopic 4 жыл бұрын

#5 is awesome!

@adamarens3520 4 жыл бұрын

Hooray for Glass!

@katelynissoshortnot 4 жыл бұрын

It's good to see your face, Michael!!

@3rdmonocle789 4 жыл бұрын

Feels surreal watching this after watching Dr Stone episode 11.

@alienachen1336 4 жыл бұрын

Cool video! Opalised fossils are also found in Nevada.

@argon000s 4 жыл бұрын

Very interesting!

@sanmigueltv 4 жыл бұрын

Very very cool 😎 .. science rocks !

@hottamalesintoledo5399 4 жыл бұрын

San Miguel TV Science studies rocks .. among other things.

@jarjarbanks6101 4 жыл бұрын

San Miguel TV Bunch of geeks .. JESUS ROCKS !

@herodaysaver9032 4 жыл бұрын

This is cool af

@yourlifeisagreatstory 4 жыл бұрын

*This morning I woke up wondering how mirrors are made, I watched several videos on YT, continued onto several videos of how glass is made... and now I sit down and see this!!! When reflecting back on the situation, I find the coincidence funny.*

@merefrog 4 жыл бұрын

Very interesting

@sophibeans 4 жыл бұрын

Woah, I have some type 4 fulgurite that I found near Daytona Beach months ago! I had no idea what it was it was until now!

@virglibrsaglove 3 жыл бұрын

That's so cool! While watching the video I wondered how many times I've seen some and not known what it was.

@Ari.exe619 4 жыл бұрын

Yay glass!

@sebastiendion3131 4 жыл бұрын

I love you guys

@JRLB38 4 жыл бұрын

Good pace with the narration, felt just a touch slower.

@LegendaryUAEGuardian Жыл бұрын

I loooooovvvvvvvvve Opals so muuuuuuch😻😻😻😻

@Beryllahawk 4 жыл бұрын

Clearly a great video :D

@naumacia Жыл бұрын

Love the new haircut! 🔥

@Karabetter 4 жыл бұрын

VERY NICE coverage of the subject !!! You achieved the level of comprehensive without being boring in any way ! Bravo !

@rainbow_vader 4 жыл бұрын

Nobody: KZfaq Recommendations: So we heard you like *_G L A S S_*

@cleverusernamenexttime2779 3 жыл бұрын

They weren't wrong.

@mikewatman5445 4 жыл бұрын

The Brilliant promo at the beginning was too funny. 😂

@TheYerjustaface 4 жыл бұрын

I found some glass once that was formed from a live powerline falling on a dirt road.

@angelwhispers2060 4 жыл бұрын

I hope it is someday possible to farm those cool glass sponges. Maybe it was through generations of cultivation get it so that they grow to at least a foot or two in less than 5 years. Or honestly I would settle for a reliable way of it's showing which ones are dead so that the dead ones could be collected from the seafloor. All very highly regulated of course but it would still be freaking cool to have one

@pheart2381 4 жыл бұрын

Moldavite,yay!

@huyked 4 жыл бұрын

Hey man/host. Your haircut and style looks great today. I think it's different from what I remember.

@Dinitroflurbenzol 4 жыл бұрын

The burning hairs of nettles (Brennnessel in german) are also made silica. Also grass stores tiny glass particles in its structure (phytolites).

@baldurk.1667 4 жыл бұрын

This episode was very interesting, but also kinda spooky! The cut left me with the impression that Michael doesn't blink...

@sabinareefing5119 4 жыл бұрын

You can find opalized shells in Southern California off the 241 freeway near the landfill. I’ve found and still have them so Australia isn’t the only place.

@camelopardalis84 4 жыл бұрын

Why does Michael sound so super relaxed? Did he get a massage right before taping this?

@MattJasa 4 жыл бұрын

The opal tech. is getting pretty advanced in lamp-working. You can't use natural opals the water content is to high they just blow up, but you can encase synthetic opals; greens, red, blue, white, RGB.

@alysonshorthouse8858 4 жыл бұрын

Why does Michael's voice sound different? Have I just become used to hearing him compere the SciShow Quiz Show using this TV voice?

@fahrinurlaub01vg 4 жыл бұрын

I was wondering that too. Maybe he's battling a cold?

@annakeye 4 жыл бұрын

@@fahrinurlaub01vg I was wondering why he wasn't blinking just about the entire time.

@fahrinurlaub01vg 4 жыл бұрын

@@annakeye obviously because he's Michael Aranda! He doesn't need that. Blinking is for common folk, like us. 😉

@culwin 4 жыл бұрын

sounds the same to me

@annakeye 4 жыл бұрын

@@fahrinurlaub01vg Or for schizophrenics, and some others on psych meds. I've seen that a lot but there's no obvious pathology going on. Not that you could diagnose from a few minutes of a video. BTW, I probably blink more than you do. Females blink more than males, so I think I'm more common than I even realised. ;)

@daniellewilson8527 4 жыл бұрын

Can you do a video about the 4 classes of Porifera?

@SunnyPea 4 жыл бұрын

Could you use any of these in glass blowing?

@pogan1983 4 жыл бұрын

6. The edge micro-barbes that cut skin when you go through tall grass.

@daedae3117 4 жыл бұрын

4:34 For some reason I read that as, " Tektitties"

@dmhq-administration Жыл бұрын

So cool and pretty. 🤔🥰🤗💖🇨🇦

@dejayrezme8617 4 жыл бұрын

Haha another reference to Blue Planet II. They seem to have found quite a few new things while filming like those venus flower baskets trapping (or sheltering) krill where they can happily live and breed away from predators.

@o00thunderhawk00o 4 жыл бұрын

yay bongs!

@cliffp.8396 4 жыл бұрын

Wow, living glass, whew my head is spinning.

@STONEDay 4 жыл бұрын

Light up my bong for glass.

@nuniyoa 4 жыл бұрын

There is an error in this video! At 4:24 the video says "but Australia is also home to the only known specimens of opalized fossils", which is not the case. Opalized fossils can be found in Nevada in the form of opalized petrified wood.