Quick Answer
The best stones for knapping tools are flint, obsidian, and chert, which are rich in silica and have a glassy fracture, allowing for sharp edges and effective cutting tools. Flint is particularly prized for its high silica content and conchoidal fracture. These stones can be knapped into a variety of tools, including knives, scrapers, and hand axes.
Choosing the Right Stone
When selecting a stone for knapping, look for those with a high silica content, typically over 70%. Flint, obsidian, and chert are all good options, as they have a glassy fracture that allows for sharp edges. Avoid stones with a high quartz content, as they tend to be more brittle and prone to cracking. A good stone should also have a conchoidal fracture, which allows for clean, sharp breaks.
Techniques for Effective Knapping
To effectively knapp a stone, start by striking the core with a hammerstone to create a series of small, controlled fractures. Use a pressure flaker, such as a small stone or bone tool, to carefully remove small flakes of stone. Work in small areas, removing flakes in a consistent pattern to create a sharp edge. Use a combination of soft and hard hammerstones to control the amount of force applied, and to achieve the desired shape and edge.
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