Discuss the physical properties of chief ores of lead and zinc.

The physical properties of the chief ores of lead and zinc, namely galena (PbS) and sphalerite (ZnS), are essential for their identification, extraction, and industrial application. These ores exhibit distinct characteristics that differentiate them from other minerals, making them of particular interest in ore geology and mining operations.

Galena (PbS), the primary ore of lead, is a relatively dense mineral with a specific gravity ranging from 7.4 to 7.6. This high density is one of its most noticeable physical properties, making it easy to separate from other less dense materials in the ore processing stages. Galena is typically found in cubic or octahedral crystals, and its cleavage is _____ ___ __________ ___ ________ _____ _____ ______ ___ ___ __________.
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