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Galena with minor pyrite
Galena with minor pyrite
Galena with baryte and pyrite from Cerro de Pasco, Peru; 5.8 cm × 4.8 cm × 4.4 cm (2.3 in × 1.9 in × 1.7 in)
Galena with baryte and pyrite from Cerro de Pasco, Peru; 5.8 cm × 4.8 cm × 4.4 cm (2.3 in × 1.9 in × 1.7 in)
Galena "cat's whisker" detector
Galena "cat's whisker" detector
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Galena-based cat's-whisker detector used in the early 1900s
Galena-based cat's-whisker detector used in the early 1900s
World War II German PbS infrared detector
World War II German PbS infrared detector