Well, yes and no. Large-scale structures don't matter a much when you're dealing with microscopic planes. That's the bugabear of carbon nanotubes, which make limpet teeth look like day-old spaghetti - 5 GPa ain't no joke but nanotubes come in at 63 GPa. Problem is, organizing materials that are almost entirely dependent on arrangement for strength is easy when you're working at micron scales. When you're trying to make a fishing rod out of it, things change. That's why 55cm of the stuff warrants a press release.
Yeah, that's why I'm skeptical of the claims that they can apply this discovery to things as large as F1 Race cars. We've been hearing claims about what graphene could potentially accomplish for years now, but a large problem remains in cost-efficient manufacturing (although I'm sure there are other factors I'm unaware of).
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.
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.