Discovery of the Genesis Rock during Apollo 15 mission

On August 1, 1971, astronauts David Scott and James Irwin discovered a rare, white rock fragment while exploring the Hadley–Apennine region of the Moon during the Apollo 15 mission. The specimen, famously known as the 'Genesis Rock', was found near the Spur crater on the slope of the Hadley Delta. Its distinctively bright, coarse-grained appearance indicated it was anorthosite, a type of rock rich in plagioclase mineral.

The discovery holds significant scientific importance as the sample is estimated to be approximately 4 billion years old. This age provides researchers with vital information regarding the formation and evolution of the ancient lunar crust. The Apollo 15 crew had undergone rigorous geological training to specifically identify such materials, and the discovery was met with great excitement as it confirmed the presence of primitive lunar crustal material that scientists had long sought.

The Genesis Rock remains one of the most famous and scientifically valuable samples ever returned to Earth. It serves as a primary reference point for understanding the early history of the Moon and the broader geological processes of the inner solar system during its infancy.