"But we mine trimonite. Hardest substance known to man. It's fifteen times harder than diamond, and extremely rare. We have little more than three tons of it on board."
Garcia to Ripley
Trimonite was the hardest material known to humans. It was 15 times harder than diamond and extremely rare.[1] The planet LV-178 contained trimonite, and was the site of many mining operations to collect the mineral for conventional use.



  1. Tim Lebbon. Alien: Out of the Shadows, p. 51 (2014), Titan Books.
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