The strongest natural fiber is spider silk. It is six times stronger than steel and can be stretched up to 50% of its length.
In terms of naturally occurring minerals, lonsdaleite seems to be the current frontrunner. However, it is extremely rare and difficult for scientists to test enough to verify its strength adequately. “The simulation showed that wurtzide boron nitride would withstand 18% more stress than diamond, and lonsdaleite 58% more.” An especially promising attribute of wurtzide boron nitride is its stability in oxygen at high temperatures; this would be a major benefit to utilizing it in the operation of drilling and cutting tools.
Tungsten has the highest tensile strength of all metals. Diamond is the hardest naturally occurring material. Carbon fiber is also particularly strong.
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