Experiments: basic research on living systems, not technology.
Also: Chrysomallon squamiferum
A deep-sea vent snail whose foot is covered with scales made of iron sulfide minerals.
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Warén and colleagues described a vent gastropod with dermal sclerites mineralised with iron sulfides, mainly pyrite plus magnetic greigite; iron sulfide was not known as a skeletal material in animals.
As reported in: Warén, Bengtson, Goffredi et al. (2003). A Hot-Vent Gastropod with Iron Sulfide Dermal Sclerites. Science. doi:10.1126/science.1087696
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Yao and colleagues used nanoscale tests and simulated predator attacks to show the multilayered iron-plated shell of Chrysomallon squamiferum resists penetration, dissipates energy and stops cracks.
As reported in: Yao, Dao, Imholt et al. (2010). Protection mechanisms of the iron-plated armor of a deep-sea hydrothermal vent gastropod. Proceedings of the National Academy of Sciences. doi:10.1073/pnas.0912988107