Before revision: Some types of raw materials are: Agate Basalt Chalcedony Chert Diorite Flint Greenstone Jadeite Jasper Obsidian Onyx Quartz Quartzite Sandstone Schist Silcrete Manufacture Stone tools are manufactured using a process known as lithic reduction .
After revision: Some types of raw materials are: Agate Basalt Chalcedony Chert Diorite Flint Greenstone Jadeite Jasper Obsidian Onyx Quartz Quartzite Sandstone Schist Silcrete Manufacture Stone tools are manufactured using a process known as magic time .