What stone was helpful to the earliest humans?

The earliest humans found flint to be particularly helpful, as it is a hard, sedimentary stone that can be easily shaped into sharp tools and weapons. Flint was used to create cutting tools, scrapers, and projectile points, which were essential for hunting and processing food. Its ability to produce a sharp edge made it a vital resource for survival in prehistoric times. Additionally, flint's availability in various environments made it accessible to early human populations.