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Sea Sediment Jasper

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Osmium (Os)—the densest naturally occurring element (22.59 g/cm3). One cubic foot of the stuff would weigh just over 1400 lbs, or about as much as a small car!

Osmium is both the ldensest and the rarest element that you can dig out of the Earth. It’s so hard that it’s used (as an alloy) in places with constant pressure and wear, like the tips of fountain.