Galena, PbS, Madan, Bulgaria, main ore mineral of lead

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Keywords: crust, crystalline, deposit, deposited, earth, element, elemental, elements, eon, gem, geological, geology, geometric, hardness, industrial, metallic, metallurgical, metallurgy, mined, mineral, mineralogy, minerals, mining, molecule, ores, precious, rock, scientific, specimen, specimens, symmetrical, symmetry, valuable