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www.reference.com/article/hardest-material-earth-47d3cef59b8c369d

As for 2014, the hardest material on earth is a diamond, a form of pure carbon. It ranks 10 on the Mohs hardness scale and has a rating of between 70 and 150 GPa, or gigapascals on the Vickers hardness scale.

www.reference.com/article/hardest-metal-9060987517dc7966

Maraging steel, which is a super-strong steel, is the hardest-known metal in the world. It is an iron alloy that contains high amounts of cobalt, nickel and molybdenum.

www.reference.com/article/hardest-metal-world-db45f22c120b53ad

Alloyed steels, steel combined with other elements to increase their hardness and strength, are the hardest known metals. Maraging steel, a heat-treated steel, is one of the strongest steel alloys.

www.reference.com/article/hardest-color-see-d53b847eb1eeff5e

Blue is the hardest color to see as more light energy is required for a full response from blue-violet cones, compared to green or red. At a certain light level, a blue-violet color appears darker than green or red, notes the UCLA Department of Atmospheric and Oceanic S...

www.reference.com/article/hardest-steel-bf0947be2f4c7b75

The hardest steel is maraging steel. Maraging steel is a low-carbon steel that is composed of iron alloyed with 15 to 25 percent nickel and other strong metals such as titanium, cobalt and molybdenum. When chromium is added to the alloy, it creates a stainless steel.

www.reference.com/article/hardest-mineral-81d202be093e20ae

Diamond is the hardest mineral known to man, according to How Stuff Works. It is assigned a rating of 10 on the Mohs Scale of Hardness, which means that it has the highest resistance to scratching.

www.reference.com/article/hardest-wood-world-430b86dcefdb80e2

The hardest wood in the world is Australian Buloke, registering 5,060 pounds of force on the Janka hardness scale. Certain strands of the wood species are listed as endangered by the Australian government. It is often used for making knife handles, flooring and furnitur...