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Galena, also called lead glance, is the natural mineral form of lead(II) sulfide. It is the most important ore of lead and an important source of silver. Galena is one of the most abundant and widely distributed sulfide minerals. It crystallizes in the cubic crystal system often showing octahedral forms.
Lead sulfide is an ionic compound of lead and sulfur, having two possible proportions: Lead sulfide, the ionic compound containing lead in the +2 oxidation state, Lead sulfide, the ionic compound containing lead in the +4 oxidation state, The mineral galena, a natural form of lead sulfide and a major source of lead,