납의 주된 광석으로 쓰이는, 납과 황의 화합물인 청회색 또는 검은색의 광물.
A bluish-gray or black mineral with a metallic luster, composed of lead sulfide; it is the primary source of lead and often contains silver.
예문:
"Galena is easily identified by its distinct cubic cleavage and high density."
"The miners extracted large quantities of galena to produce lead for industrial use."
"In early radio sets, a crystal of galena was used as a point-contact diode to detect signals."