Okay, maybe I'm an idiot, but this is one of those facts I'd missed until recently. Despite the impression you may have gotten from grade school and/or old Superman cartoons, diamonds are probably not lumps of coal that just got compressed real good—at least, not in exactly the way you might imagine.
Diamonds are made out of carbon, but the best evidence suggests that they form far more deeply down in the Earth than coal does. Instead of coal being smushed into diamonds, imagine something more like those "grow crystals out of Borax and water" experiments you did in grade school. Only, in this case, the experiment is performed in the fiery depths of Hell, as very un-coal-like atoms of carbon are compressed and heated deep in the Earth's mantle until they start to bond together and grow into a crystalline structure.
Once the crystals are formed, they get to the surface of the Earth via volcanic eruptions.
The really interesting thing about all of this is that it's one of those ideas that's very hard to verify. Diamonds form at a depth we can't go observe directly. All we have to work with is indirect evidence. Because of that, nobody knows exactly where the necessary carbon to make diamonds comes from. This is why the "diamonds are coal" story exists. Some scientists think the carbon is stuff that's existed in the Earth since this planet was formed. Others think it might be coming from terrestrial carbon that got shifted down to the lower levels via plate subduction—although, even then, we're talking about carbon, but not necessarily coal. It could be a combination of both. Either way, the mental image of smushed coal doesn't quite work.
Read the American Museum of Natural History's explanation of where diamonds come from
Read an interview about diamonds with the curator of the U.S. National Gem and Mineral Collection
Thanks to a story written by Geology.com's Hobart King for busting the myth and inspiring to me to read a little more on this
Image: Diamonds, a Creative Commons Attribution (2.0) image from kimberlyeternal's photostream
The PocketLab is billed as a “Swiss Army Knife of science.” Launched via Kickstarter, the small device contains numerous sensors to measure acceleration, force, angular velocity, magnetic field, pressure, altitude, and temperature and send that data to smartphones or laptops. According to inventor Clifton Roozeboom, it’s a tool for students and citizen scientists who can’t […]
In the 2015 Sense About Science lecture (MP3), Tracey Brown discusses the worst casualty of politicization of science, from fluoride to climate change — the truth.
A booming biotech business in South Korea has new customers in America, because everyone wants to clone their dog.
SitePoint Premium is the ultimate e-learning library for web developers, designers, and digital professionals. Famous for their web development books written by industry leaders, they’ve expanded their content library to include in-depth video courses and short, handy screencasts partnering with A Book Apart and UX Mastery. Whatever you want to achieve in your web career, […]
Skip the technical jargon and get right to taking amazing, professional-quality photos with this complete training. The Hollywood Art Institute Photography Course includes 22 modules filled with tutorials on how to profit off of your photography, or simply capture your memories in the manner they deserve.Accredited by the Photography Education Accreditation CouncilDive into this 22 […]
Power up your gadgets in the most unexpected places with the extremely compact SolarJuice battery pack. SolarJuice charges up at home like your average battery pack, but also lets you add extra juice on-the-go using its built-in solar panel—so you’ll never be left unplugged from the digital world.4.5 Stars on Amazon!Simultaneously charges 2 devices at […]