Where is polonium found in nature?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — oxygen group element Modern version of the periodic table of the elements (printable).

Polonium is an extremely rare element found in nature as a radioactive decay product of uranium, thorium, and actinium.1

It occurs in trace amounts within pitchblende, a uranium ore, with an abundance in the Earth’s crust of approximately one part in $10^{15}$ . Due to its scarcity, it is typically isolated as a by-product during the extraction of radium from uranium minerals.1