www.iflscience.com/plants-and-animals/worlds-strongest-natural-material-limpet-teeth

Feb 19, 2015 ... What's stronger than spider silk? ... that their teeth contain a hard, iron-containing mineral called goethite, which forms in the animal as it grows.

comicvine.gamespot.com/forums/battles-7/vibranium-vs-promethium-vs-adamantium-vs-nth-metal-670278

I think primary adamantium would be the strongest metal and most durable. ..... the only True Adamantium left in the entire 616 Marvel Universe is in Captain ...

olddungeonmaster.com/2016/12/02/dd-5e-metals

Dec 2, 2016 ... Iron, 1 sp, ferrous, 19, Iron is a silver-white malleable metal that readily rusts in moist air, occurs native in meteorites and combined in most ...

wow.gamepedia.com/Metal

Nov 9, 2018 ... Metals are mineral items found as raw ore (in most cases) by mining ... Felsteel - Alloy of Fel Iron and Eternium; [Hardened Khorium] - Alloy of ...

scienceline.ucsb.edu/getkey.php?key=2687

Some other heavy metals include tungsten and gold (19.3 kg/L), which are almost as ... in that case, the densest chemical element is osmium (which is a metal).

www.technologyreview.com/s/518301/new-form-of-carbon-is-stronger-than-graphene-and-diamond

Aug 15, 2013 ... Chemists have calculated that chains of double or triple-bonded carbon atoms, known as carbyne, should be stronger and stiffer than any ...

www.dimensionsthruart.com/pages.php?pageid=21

Metals, whether it's copper, brass, bronze, iron or steel, have always been the materials for artists throughout the centuries to test and stretch their imaginations.

hobbylark.com/fandoms/Superhero-Academy-101-Metallurgy-Vibranium-Adamantium-and-Uru

Dec 29, 2017 ... The use of metals within every universe is important regardless of ... or proto- adamantium/vibranium, is still far stronger than titanium steel.

www.thegeektwins.com/2015/06/5-supervillains-who-broke-captain.html

Jun 23, 2015 ... ... basically one of the most powerful villains in the Marvel Universe. ... Iron Man's armor, the Silver Surfer's board, and Captain America's shield.