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It is hard to determine what percent of the Earth's crust is galena. We can estimate it by looking at the prevalence of lead in the Earth's crust. One source estimates it at .0013% (see second reference below). Since galena is the most common source of lead in the Earth's crust we can estimate that the percent of galena is a little less than this, say around .001%. There is likely to be some lead in uranium deposits where the uranium has had time to decay into lead. There are other minerals of lead but they are less prevalent. It is hard to say. If half of the lead were not in the form of galena and the rest was it would still come out to about .001% (rounded up).
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