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...and graphene is a lot lighter than anything involving iron ore...
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GoethiteGoethite is an iron oxyhydroxide containing ferric iron. It is the main component of rust and bog iron ore. Goethite's hardness ranges from 5.0 to 5.5 on the Mohs Scale, and its specific gravity varies from 3.3 to 4.3. The mineral forms prismatic needle-like crystals ("needle iron ore"), but is more typically massive.
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distractorman · 3426 days ago · link ·
The mineral being needle like means the creature doesn't need to 'sharpen' its teeth. They come sharp as a property of the mineral structure. Very interesting.