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Fool’s Gold Might Be Better Than the Real Thing
YouTube: | https://youtube.com/watch?v=W-G8lvsrdf0 |
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Duration: | 07:28 |
Uploaded: | 2024-05-01 |
Last sync: | 2024-12-17 10:30 |
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MLA Full: | "Fool’s Gold Might Be Better Than the Real Thing." YouTube, uploaded by SciShow, 1 May 2024, www.youtube.com/watch?v=W-G8lvsrdf0. |
MLA Inline: | (SciShow, 2024) |
APA Full: | SciShow. (2024, May 1). Fool’s Gold Might Be Better Than the Real Thing [Video]. YouTube. https://youtube.com/watch?v=W-G8lvsrdf0 |
APA Inline: | (SciShow, 2024) |
Chicago Full: |
SciShow, "Fool’s Gold Might Be Better Than the Real Thing.", May 1, 2024, YouTube, 07:28, https://youtube.com/watch?v=W-G8lvsrdf0. |
This month's Rocks Box is pyrite, also called fool's gold. But this fool's gold might not be so foolish, since we can use it to get all kinds of other minerals we really need, and it may be a key to getting real gold after all.
Hosted by: Stefan Chin (he/him)
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Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow
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Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Adam Brainard, Alex Hackman, Ash, Benjamin Carleski, Bryan Cloer, charles george, Chris Mackey, Chris Peters, Christoph Schwanke, Christopher R Boucher, DrakoEsper, Eric Jensen, Friso, Garrett Galloway, Harrison Mills, J. Copen, Jaap Westera, Jason A Saslow, Jeffrey Mckishen, Jeremy Mattern, Kenny Wilson, Kevin Bealer, Kevin Knupp, Lyndsay Brown, Matt Curls, Michelle Dove, Piya Shedden, Rizwan Kassim, Sam Lutfi
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Sources:
https://www.mindat.org/min-3314.html https://www.thermofisher.com/blog/mining/pyrite-the-real-story-behind-fools-gold/
https://www.britannica.com/science/pyrite
https://patents.google.com/patent/US2872294A/en
https://www.sciencedirect.com/science/article/pii/S0892687522001285
https://theconversation.com/not-so-foolish-after-all-fools-gold-contains-a-newly-discovered-type-of-real-gold-161819
https://pubs.geoscienceworld.org/gsa/geology/article/49/10/1225/604581/A-new-kind-of-invisible-gold-in-pyrite-hosted-in
https://www.sciencedirect.com/topics/earth-and-planetary-sciences/chalcopyrite
https://dnr.mo.gov/document-search/pyrite-pub2922/pub2922
https://www.pv-magazine.com/2020/06/15/a-long-way-to-go-for-iron-pyrite-solar-cells/
https://www.mindat.org/min-955.html
Image Sources:
https://commons.wikimedia.org/wiki/File:1850_Woman_and_Men_in_California_Gold_Rush.jpg
https://tinyurl.com/5y96x8m3
https://tinyurl.com/s33bh47w
https://tinyurl.com/2je9243t
https://tinyurl.com/2e5thped
https://tinyurl.com/yww87nx9
https://tinyurl.com/yv2rnt6f
https://tinyurl.com/mrxmy4hb
https://tinyurl.com/3wpfhprw
https://commons.wikimedia.org/wiki/File:Michelinoceras_aldenense_fossil_nautiloid_%28Alden_Pyrite_Bed,_Ludlowville_Formation,_Middle_Devonian;_western_New_York_State,_USA%29_%2815360914300%29.jpg
https://commons.wikimedia.org/wiki/File:Zamek_kołowy.jpg
https://tinyurl.com/58zvsaur
https://tinyurl.com/3vmwtw93
https://tinyurl.com/y2fkvdfj
https://tinyurl.com/h4shba2n
https://www.gettyimages.com/detail/video/sulfur-dioxide-molecule-stock-footage/1715451505
https://www.gettyimages.com/detail/photo/selective-focus-of-strong-sulfuric-acid-chemical-in-royalty-free-image/1271724473?phrase=sulfuric+acid
https://www.gettyimages.com/detail/photo/feeding-lawn-with-granular-fertilizer-for-perfect-royalty-free-image/1265209398?phrase=fertilizer
https://www.gettyimages.com/detail/photo/mechanic-replaces-the-car-battery-discharging-the-royalty-free-image/1450327004?phrase=car+battery
https://www.gettyimages.com/detail/photo/fireworks-or-explosives-with-sparkling-lit-fuse-royalty-free-image/174429432?phrase=explosive
https://www.gettyimages.com/detail/video/drone-flight-past-working-pumpjack-in-midway-sunset-oil-stock-footage/900906140
https://www.gettyimages.com/detail/video/chalcopyrite-mineral-sample-in-rotation-with-white-stock-footage/1090411344
https://www.gettyimages.com/detail/video/mineral-chalcopyrite-close-up-stone-texture-panorama-stock-footage/1351989160
https://www.gettyimages.com/detail/video/bubbles-rising-underwater-in-a-dark-sea-4k-stock-footage/1251591563
https://www.gettyimages.com/detail/photo/dry-river-sand-explosion-golden-colored-sand-splash-royalty-free-image/1023607692?phrase=mineral+powder
https://www.gettyimages.com/detail/photo/rocks-and-minerals-pyrite-royalty-free-image/157305903?phrase=pyrite
https://www.gettyimages.com/detail/photo/closeup-of-big-gold-nugget-royalty-free-image/598055968?phrase=gold+mineral
https://www.gettyimages.com/detail/video/gold-prospector-stock-footage/970019112
https://commons.wikimedia.org/wiki/File:Gossan_%26_aurichalcite_(probably_Mexico).jpg
https://commons.wikimedia.org/wiki/File:Gold-Pyrite-263193.jpg
https://www.gettyimages.com/detail/photo/iron-royalty-free-image/639850064?phrase=iron+atom
https://www.gettyimages.com/detail/photo/gold-robbery-royalty-free-image/157485372?phrase=gold+thief
https://theconversation.com/not-so-foolish-after-all-fools-gold-contains-a-newly-discovered-type-of-real-gold-161819
https://www.gettyimages.com/detail/photo/gold-encrusted-rock-royalty-free-image/113548182?phrase=gold+mineral
https://www.gettyimages.com/detail/video/microscopic-bacteria-medical-background-stock-footage/519456917
Hosted by: Stefan Chin (he/him)
----------
Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow
----------
Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Adam Brainard, Alex Hackman, Ash, Benjamin Carleski, Bryan Cloer, charles george, Chris Mackey, Chris Peters, Christoph Schwanke, Christopher R Boucher, DrakoEsper, Eric Jensen, Friso, Garrett Galloway, Harrison Mills, J. Copen, Jaap Westera, Jason A Saslow, Jeffrey Mckishen, Jeremy Mattern, Kenny Wilson, Kevin Bealer, Kevin Knupp, Lyndsay Brown, Matt Curls, Michelle Dove, Piya Shedden, Rizwan Kassim, Sam Lutfi
----------
Looking for SciShow elsewhere on the internet?
SciShow Tangents Podcast: https://scishow-tangents.simplecast.com/
TikTok: https://www.tiktok.com/@scishow
Twitter: http://www.twitter.com/scishow
Instagram: http://instagram.com/thescishow
Facebook: http://www.facebook.com/scishow
#SciShow #science #education #learning #complexly
----------
Sources:
https://www.mindat.org/min-3314.html https://www.thermofisher.com/blog/mining/pyrite-the-real-story-behind-fools-gold/
https://www.britannica.com/science/pyrite
https://patents.google.com/patent/US2872294A/en
https://www.sciencedirect.com/science/article/pii/S0892687522001285
https://theconversation.com/not-so-foolish-after-all-fools-gold-contains-a-newly-discovered-type-of-real-gold-161819
https://pubs.geoscienceworld.org/gsa/geology/article/49/10/1225/604581/A-new-kind-of-invisible-gold-in-pyrite-hosted-in
https://www.sciencedirect.com/topics/earth-and-planetary-sciences/chalcopyrite
https://dnr.mo.gov/document-search/pyrite-pub2922/pub2922
https://www.pv-magazine.com/2020/06/15/a-long-way-to-go-for-iron-pyrite-solar-cells/
https://www.mindat.org/min-955.html
Image Sources:
https://commons.wikimedia.org/wiki/File:1850_Woman_and_Men_in_California_Gold_Rush.jpg
https://tinyurl.com/5y96x8m3
https://tinyurl.com/s33bh47w
https://tinyurl.com/2je9243t
https://tinyurl.com/2e5thped
https://tinyurl.com/yww87nx9
https://tinyurl.com/yv2rnt6f
https://tinyurl.com/mrxmy4hb
https://tinyurl.com/3wpfhprw
https://commons.wikimedia.org/wiki/File:Michelinoceras_aldenense_fossil_nautiloid_%28Alden_Pyrite_Bed,_Ludlowville_Formation,_Middle_Devonian;_western_New_York_State,_USA%29_%2815360914300%29.jpg
https://commons.wikimedia.org/wiki/File:Zamek_kołowy.jpg
https://tinyurl.com/58zvsaur
https://tinyurl.com/3vmwtw93
https://tinyurl.com/y2fkvdfj
https://tinyurl.com/h4shba2n
https://www.gettyimages.com/detail/video/sulfur-dioxide-molecule-stock-footage/1715451505
https://www.gettyimages.com/detail/photo/selective-focus-of-strong-sulfuric-acid-chemical-in-royalty-free-image/1271724473?phrase=sulfuric+acid
https://www.gettyimages.com/detail/photo/feeding-lawn-with-granular-fertilizer-for-perfect-royalty-free-image/1265209398?phrase=fertilizer
https://www.gettyimages.com/detail/photo/mechanic-replaces-the-car-battery-discharging-the-royalty-free-image/1450327004?phrase=car+battery
https://www.gettyimages.com/detail/photo/fireworks-or-explosives-with-sparkling-lit-fuse-royalty-free-image/174429432?phrase=explosive
https://www.gettyimages.com/detail/video/drone-flight-past-working-pumpjack-in-midway-sunset-oil-stock-footage/900906140
https://www.gettyimages.com/detail/video/chalcopyrite-mineral-sample-in-rotation-with-white-stock-footage/1090411344
https://www.gettyimages.com/detail/video/mineral-chalcopyrite-close-up-stone-texture-panorama-stock-footage/1351989160
https://www.gettyimages.com/detail/video/bubbles-rising-underwater-in-a-dark-sea-4k-stock-footage/1251591563
https://www.gettyimages.com/detail/photo/dry-river-sand-explosion-golden-colored-sand-splash-royalty-free-image/1023607692?phrase=mineral+powder
https://www.gettyimages.com/detail/photo/rocks-and-minerals-pyrite-royalty-free-image/157305903?phrase=pyrite
https://www.gettyimages.com/detail/photo/closeup-of-big-gold-nugget-royalty-free-image/598055968?phrase=gold+mineral
https://www.gettyimages.com/detail/video/gold-prospector-stock-footage/970019112
https://commons.wikimedia.org/wiki/File:Gossan_%26_aurichalcite_(probably_Mexico).jpg
https://commons.wikimedia.org/wiki/File:Gold-Pyrite-263193.jpg
https://www.gettyimages.com/detail/photo/iron-royalty-free-image/639850064?phrase=iron+atom
https://www.gettyimages.com/detail/photo/gold-robbery-royalty-free-image/157485372?phrase=gold+thief
https://theconversation.com/not-so-foolish-after-all-fools-gold-contains-a-newly-discovered-type-of-real-gold-161819
https://www.gettyimages.com/detail/photo/gold-encrusted-rock-royalty-free-image/113548182?phrase=gold+mineral
https://www.gettyimages.com/detail/video/microscopic-bacteria-medical-background-stock-footage/519456917
Back in the 1840s, the California hills were crawling with miners seeking their fortune in the gold rush.
Prospectors would rush in to stake their claim on glittering mineral deposits, but all too often, they found pyrite instead, hence the more common name of fool’s gold. But fool’s gold might not be as foolish, or worthless, as those prospectors first thought.
We can actually use it to get our hands on some really useful stuff, like sulfur and copper. And thanks to some recent discoveries, it may even help us mine real gold, after all. [♪ INTRO] The name pyrite comes from the Greek word ‘pyr’, meaning ‘fire’, because it makes sparks when it’s struck against metal. And it’s a really simple mineral.
It only has two ingredients, iron and sulfur. Inside, those elements can be arranged in a few different isometric crystal structures, from cubes to octahedrons or dodecahedrons. So pyrite crystals can look like half of the shapes in a set of table top dice.
It’s also thought that these shapes could have been the inspiration for the Platonic solids that ancient Greek philosophers, including Plato, believed were the basic elements of the universe. Those early philosophers would have certainly had plenty of opportunity to study pyrite crystals, since it’s a pretty common mineral in all kinds of rocks. You can find it in mineral veins, coal seams, stalactites, and around the edges of magma intrusions.
It can even be produced biologically by certain kinds of bacteria, and it’s not uncommon to find entire fossils made of pyrite, which are stunningly cool to look at. So, with so much of it around, it’s no wonder that people have tried so hard to find uses for the stuff. In the early 1500s, pyrite put the fire in some of the earliest firearms in Europe.
These wheel-lock guns would rub a serrated steel wheel against a piece of pyrite to make the sparks, which ignited the gunpowder. It’s the same idea as modern lighters that use a spark wheel, or those strikers you may have used to light your Bunsen burner in chem class. Just with pyrite instead of the flint that’s more common today.
But pyrite’s most important application is its use in the exploration and exploitation of ores. An ore is defined as any natural rock or mineral from which a valuable metal or other material can be extracted. And despite what video games may suggest, there’s not just one ore for each material.
Pyrite is a great example of an ore for something we use all the time. Weirdly enough, it’s not iron, even though pyrite is chock full of the stuff. It’s much easier to extract iron from oxide minerals like hematite and magnetite, so processing pyrite for iron is basically more trouble than it’s worth.
But pyrite is a much better ore for its other main component, sulfur. Pyrite is the most abundant sulfide mineral in the world. And sulfur compounds have a ton of industrial and commercial uses.
For instance, sulfur dioxide is used as a food preservative and a bleaching agent. And sulfuric acid is the most widely used industrial chemical of any kind. It’s used to make fertilizers, car batteries, explosives, and much more.
Now, to release that sulfur, you start by roasting your pyrite at around 600 degrees Celsius, which causes the sulfur to burn with oxygen in the air to make sulfur dioxide. Then you just add water, and you’ve got sulfuric acid. And historically, pyrite was a critical source of the sulfur for all of this.
But these days, we collect most of the industrial sulfur we need as a byproduct of the petroleum industry, so pyrite is not the king of that particular smelly hill. We do still use pyrite in the ore processing industry though, thanks to one of its crystal sisters. One of the most important ores for copper is a mineral called chalcopyrite, which often forms alongside pyrite in the same deposits.
The problem is that chalcopyrite is also mixed up with other minerals that are totally worthless, at least if your goal is to smelt some copper. A common technique used to separate chalcopyrite from the other minerals is to grind everything up really small and add it all into water tanks. Metal-bearing particles are slightly hydrophobic, so they will attach to air bubbles and float to the surface, making what’s kind of a copper-rich foam, while other minerals are carried away in the water.
Sounds great, but there’s a trick to getting it just right. When the particles are ground too fine, it’s harder for them to get into the foam because they’re too small and miss the air bubbles, meaning that as much as 15% of the copper in the chalcopyrite gets washed away. And this is where pyrite comes in!
Researchers have found that specially treated ground-up pyrite particles can act like a pool floaty for the super-fine chalcopyrite. The fine particles will stick to the pyrite crumbs and get transported up into the foam, saving them from getting lost. The scientists think this new process could allow them to recover almost all of the copper in a chalcopyrite deposit.
All thanks to a little pyrite shuttle! Which brings us to the coolest use for pyrite of all. So-called fool’s gold might actually be the key to finding real gold.
The two often form together, especially in mineral veins, so pyrite can help traditional prospectors zero in on gold deposits. Plus, pyrite tends to oxidize when exposed to the air, creating a distinctive rust-colored deposit called a gossan. This gossan tells miners where those pyrite and potentially gold-rich mineral veins reach the surface, and where they should drill.
But it gets even better than that. In some cases, pyrite itself can contain small but significant amounts of gold. These can be tiny inclusions within the pyrite crystal that have become trapped as the two minerals have grown together.
And sometimes iron atoms can even get replaced by atoms of gold in the crystal structure to make a kind of alloy within the pyrite mineral. Now, while it is technically possible to extract this gold from inside the pyrite, you’d have to do some pretty major processing, which takes a lot of energy and money. So you’d have to really want that gold.
But scientists have recently discovered a third way that gold and pyrite can be neighbors, which could make it way easier to separate them. Using a high-resolution atom probe, researchers built a 3D map of the elements inside pyrite’s crystal structure. And they saw that gold atoms can concentrate wherever there are imperfections in the crystal lattice, which happens when pyrite is deformed at high temperatures.
That causes atomic bonds to slip and become misaligned, which lets the gold in. The researchers think that those gold clusters could be a target for a more environmentally friendly extraction method called bio-leaching, and you’re not gonna believe the twist here. Bio-leaching out the gold would rely on rock-munching bacteria that can break down the crystal around the already-weakened dislocations.
And once it’s broken down, you can just pop out the gold that’s left behind and run off to the jeweler. So what was once thought to be just a junk mineral during the Gold Rush may turn out to be as cool as the real thing. Speaking of a gold rush, if you want your own beautiful piece of pyrite, you should hurry to SciShow.
Rocks to sign up for our SciShow Rocks Box subscription. Every month, we send our subscribers a high-quality, ethically sourced mineral that has its own fascinating science story, which we tell with these videos. But the subscriptions do fill up fast, so check it out soon if you’re interested, and thanks for watching! [♪ OUTRO]
Prospectors would rush in to stake their claim on glittering mineral deposits, but all too often, they found pyrite instead, hence the more common name of fool’s gold. But fool’s gold might not be as foolish, or worthless, as those prospectors first thought.
We can actually use it to get our hands on some really useful stuff, like sulfur and copper. And thanks to some recent discoveries, it may even help us mine real gold, after all. [♪ INTRO] The name pyrite comes from the Greek word ‘pyr’, meaning ‘fire’, because it makes sparks when it’s struck against metal. And it’s a really simple mineral.
It only has two ingredients, iron and sulfur. Inside, those elements can be arranged in a few different isometric crystal structures, from cubes to octahedrons or dodecahedrons. So pyrite crystals can look like half of the shapes in a set of table top dice.
It’s also thought that these shapes could have been the inspiration for the Platonic solids that ancient Greek philosophers, including Plato, believed were the basic elements of the universe. Those early philosophers would have certainly had plenty of opportunity to study pyrite crystals, since it’s a pretty common mineral in all kinds of rocks. You can find it in mineral veins, coal seams, stalactites, and around the edges of magma intrusions.
It can even be produced biologically by certain kinds of bacteria, and it’s not uncommon to find entire fossils made of pyrite, which are stunningly cool to look at. So, with so much of it around, it’s no wonder that people have tried so hard to find uses for the stuff. In the early 1500s, pyrite put the fire in some of the earliest firearms in Europe.
These wheel-lock guns would rub a serrated steel wheel against a piece of pyrite to make the sparks, which ignited the gunpowder. It’s the same idea as modern lighters that use a spark wheel, or those strikers you may have used to light your Bunsen burner in chem class. Just with pyrite instead of the flint that’s more common today.
But pyrite’s most important application is its use in the exploration and exploitation of ores. An ore is defined as any natural rock or mineral from which a valuable metal or other material can be extracted. And despite what video games may suggest, there’s not just one ore for each material.
Pyrite is a great example of an ore for something we use all the time. Weirdly enough, it’s not iron, even though pyrite is chock full of the stuff. It’s much easier to extract iron from oxide minerals like hematite and magnetite, so processing pyrite for iron is basically more trouble than it’s worth.
But pyrite is a much better ore for its other main component, sulfur. Pyrite is the most abundant sulfide mineral in the world. And sulfur compounds have a ton of industrial and commercial uses.
For instance, sulfur dioxide is used as a food preservative and a bleaching agent. And sulfuric acid is the most widely used industrial chemical of any kind. It’s used to make fertilizers, car batteries, explosives, and much more.
Now, to release that sulfur, you start by roasting your pyrite at around 600 degrees Celsius, which causes the sulfur to burn with oxygen in the air to make sulfur dioxide. Then you just add water, and you’ve got sulfuric acid. And historically, pyrite was a critical source of the sulfur for all of this.
But these days, we collect most of the industrial sulfur we need as a byproduct of the petroleum industry, so pyrite is not the king of that particular smelly hill. We do still use pyrite in the ore processing industry though, thanks to one of its crystal sisters. One of the most important ores for copper is a mineral called chalcopyrite, which often forms alongside pyrite in the same deposits.
The problem is that chalcopyrite is also mixed up with other minerals that are totally worthless, at least if your goal is to smelt some copper. A common technique used to separate chalcopyrite from the other minerals is to grind everything up really small and add it all into water tanks. Metal-bearing particles are slightly hydrophobic, so they will attach to air bubbles and float to the surface, making what’s kind of a copper-rich foam, while other minerals are carried away in the water.
Sounds great, but there’s a trick to getting it just right. When the particles are ground too fine, it’s harder for them to get into the foam because they’re too small and miss the air bubbles, meaning that as much as 15% of the copper in the chalcopyrite gets washed away. And this is where pyrite comes in!
Researchers have found that specially treated ground-up pyrite particles can act like a pool floaty for the super-fine chalcopyrite. The fine particles will stick to the pyrite crumbs and get transported up into the foam, saving them from getting lost. The scientists think this new process could allow them to recover almost all of the copper in a chalcopyrite deposit.
All thanks to a little pyrite shuttle! Which brings us to the coolest use for pyrite of all. So-called fool’s gold might actually be the key to finding real gold.
The two often form together, especially in mineral veins, so pyrite can help traditional prospectors zero in on gold deposits. Plus, pyrite tends to oxidize when exposed to the air, creating a distinctive rust-colored deposit called a gossan. This gossan tells miners where those pyrite and potentially gold-rich mineral veins reach the surface, and where they should drill.
But it gets even better than that. In some cases, pyrite itself can contain small but significant amounts of gold. These can be tiny inclusions within the pyrite crystal that have become trapped as the two minerals have grown together.
And sometimes iron atoms can even get replaced by atoms of gold in the crystal structure to make a kind of alloy within the pyrite mineral. Now, while it is technically possible to extract this gold from inside the pyrite, you’d have to do some pretty major processing, which takes a lot of energy and money. So you’d have to really want that gold.
But scientists have recently discovered a third way that gold and pyrite can be neighbors, which could make it way easier to separate them. Using a high-resolution atom probe, researchers built a 3D map of the elements inside pyrite’s crystal structure. And they saw that gold atoms can concentrate wherever there are imperfections in the crystal lattice, which happens when pyrite is deformed at high temperatures.
That causes atomic bonds to slip and become misaligned, which lets the gold in. The researchers think that those gold clusters could be a target for a more environmentally friendly extraction method called bio-leaching, and you’re not gonna believe the twist here. Bio-leaching out the gold would rely on rock-munching bacteria that can break down the crystal around the already-weakened dislocations.
And once it’s broken down, you can just pop out the gold that’s left behind and run off to the jeweler. So what was once thought to be just a junk mineral during the Gold Rush may turn out to be as cool as the real thing. Speaking of a gold rush, if you want your own beautiful piece of pyrite, you should hurry to SciShow.
Rocks to sign up for our SciShow Rocks Box subscription. Every month, we send our subscribers a high-quality, ethically sourced mineral that has its own fascinating science story, which we tell with these videos. But the subscriptions do fill up fast, so check it out soon if you’re interested, and thanks for watching! [♪ OUTRO]