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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-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-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...

www.reference.com/article/hardest-mineral-world-398620b368c4bb96

The hardest natural mineral in the world is lonsdaleite, a rare mineral made of carbon atoms. This mineral can withstand up to 58 percent more stress than diamond, according to a report by Jessica Griggs of NewScientist.

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-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-metal-earth-ab13c4e3e9814f4a

Maraging steel is the hardest metal on Earth. This steel is an alloy of nickel, cobalt and molybdenum. Most of the hardest metals are not naturally occurring; instead, they are man-made alloys.