Scientists seem to have discovered a new natural super-heavy element. The element was in the theoretic super-heavy periodic table since a long time under the name of unbibium or eka-thorium, but unlike at many other such elements that were created artificially in giant particle accelerators, with the life time of just tiny fractions of a second, unbibium was now discovered to be naturally available and very stable (estimated half life of 100 millions years). Marinov, the researcher who detected the element, claims it is as abundant in nature as lead.
the physics arXiv blog » Blog Archive » First superheavy element found in nature
The discovery still waits to be verified by peers.
I did not manage to find any information about the estimated density, but since it has much higher atomic number (P122) than lead (P82 / 11.3 g/cm3), or even than uranium (P92 / 19.1 g/cm3), it will be likely quite high. We can look forward to a new class of highly miniaturized diving weights
