Which other rocks were used when flint was unavailable?

When flint was unavailable, prehistoric peoples utilized a variety of other materials that were locally accessible. Because flint and similar siliceous stones were preferred for their ability to be easily chipped into sharp cutting edges, humans adapted by using whatever suitable rock was available in their region.1

Common alternatives included:
* Quartz and Quartzite: These were frequently used as substitutes for flint.21
* Obsidian: This volcanic glass was highly valued because its conchoidal fracture allowed for the creation of extremely sharp artifacts, similar to those made from flint.231
* Volcanic Rocks: Various types of volcanic rock were employed when flint could not be found.14
* Sandstones: Fine-grained sandstones were also utilized for toolmaking.14

The selection of these materials was driven by the necessity of finding hard, fine-grained stones that could be shaped to hold a functional edge. While flint remained the material of choice due to its ideal physical properties, the use of these diverse alternatives demonstrates the resourcefulness of early human populations in adapting to their specific environments.421