We all know the cartoon of the "cave man" bearing his stone axe. How crude life must have been, we may think, when there was no metal. But stone is a worthy servant. In fact, stone tools have been found that are more than 2 million years old. This means that stone technology is not something Homo sapiens invented—we inherited it from earlier hominid species.
And stone tools are still around. I don't mean stone used for construction, but things you can hold in your hand and do stuff with.
Stone Grinding Tools
Start with grinding. One stone tool that's still in common kitchen use is the mortar and pestle, better than anything for turning things to a powder or paste. (Those are made of marble or agate.) And maybe you seek out stoneground flour for your baking needs. (Grindstones are made of quartzite and similar rocks.) Perhaps the highest use of stone today along these lines is in the tough, heavy granite rollers used for grinding and conching chocolate. And let's not forget chalk, the soft stone used for writing on blackboards or sidewalks.
Edged Stone Tools
But what makes me light up is edged stone tools. If you spend enough time in suitable country, one day you'll pick up an ancient arrowhead. The utter coolness of the technology really comes home when you look at one of these stone tools close up, like some of the delicate points at arrowheads.com.
The technique of making them is called knapping (with a silent K), and it involves striking stones with harder stones, or highly controlled pressure flaking with pieces of antler and similar materials. It takes years of practice, and you cut your hands a lot until you become an expert. The type of stone used is typically chert.
Chert is a form of quartz with an exceedingly fine grain. Different types are called flint, agate, and chalcedony. A similar rock, obsidian, forms from high-silica lava and is the best knapping stone of all.
These stone tools—points, blades, scrapers, axes and more—are often the only evidence we have from archaeological sites. They are cultural fossils, and like true fossils, they have been collected and classified for many years around the world. Modern geochemical techniques like neutron activation analysis, coupled with growing databases of the sources of toolmaking stone, are allowing us to trace the movements of prehistoric peoples and the patterns of trade among them.
Stone Tools Today
Another thing that makes me light up is knowing that this technology is being revived and preserved by a bunch of fanatic knappers. They'll show you how at a local knap-in, they'll sell you videotapes and books, and of course they'll put their passion on the web. The best knapping websites, I think, are Knappers Anonymous and flintknapping.com, but if you want to follow the arrowhead trail to the scientific end of things, start with the lithics page from Kris Hirst, the About Archaeology Guide.
The knapper/artist Errett Callahan has devoted his career to reproducing all the ancient tools, then moving beyond them. He and other practitioners have brought this technology into what he calls the Post-Neolithic period. His fantasy knives will make your jaws drop.
PS: Obsidian scalpels are the sharpest in the world, and plastic surgeons rely on them more and more for operations where scarring must be minimized. Truly, the stone edge is here to stay.