Some ground stone tools are incidental, caused by use with other tools: manos[?], for example, are hand stones used in conjunction with metates[?] and other grinding slabs, and develop their ground surfaces through wear. Other ground stone tools include adzes, celts, and axes, which are manufactured using a labor-intensive, time-consuming method of repeated grinding against a harder stone, often using water as a lubricant. These tools are often made using durable finer-grained materials rather than coarse materials.
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