Galena is a shiny, metallic gray mineral made of lead and sulfur. It's the main ore from which we extract lead, meaning that almost all the lead used in batteries, radiation shields, and other products comes from galena mined from the Earth.

Galena has a distinctive appearance: it breaks naturally into perfect cubes with mirror-like surfaces that glint when light hits them. Ancient civilizations prized galena both for lead and because they could grind it into powder for eye makeup. The ancient Egyptians used galena-based cosmetics, which they believed had protective powers.

The mineral forms deep underground where hot, mineral-rich water flows through cracks in rocks and cools down. When miners find galena, it often appears alongside other valuable minerals like silver, which made galena mines economically important throughout history.

Because galena contains lead, which is toxic, people who handle it need to be careful and wash their hands afterward. Museums and rock collectors still prize galena specimens for their perfect cubic crystals and metallic luster, making it one of the most recognizable minerals you might see in a geology collection.