Definition of "galena"

You can easily extract lead from galena, a natural mineral which has been used in crystal radio receivers.

1939 November, Raymond B. Wailes, “Chemical Engineering for Home Experimenters”, in Popular Science, page 207

The galena of the ore contains microscopic inclusions of various forms that become visible upon polished surfaces etched with hydrochloric or nitric acid.

1942, G. F. Loughlin, A. H. Koschmann, Geology and Ore Deposits of the Magdalena Mining District, New Mexico, Geological Survey Professional Paper, Issue 200, page 98

These samples had higher Pb206 and Pb208 abundances than any other galenas yet examined.

1953, “Report of the Committee on the Measurement of Geologic Time”, in U.S, National Research Council, page 132

Very little galena has been reported (recovered mostly from burial mounds) in the Great Lakes region indicating that the mineral was not a major interregional exchange commodity during this period. However, numerous galenas have been recovered from the lower Mississippi Valley region and Florida indicating that galena was part of an important north-south exchange system (Walthall 1981).

2008, Sanghamitra Ghosh, Heavy Stable Isotope Investigations in Environmental Science and Archaeology, page 77