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Grinding SlabIn archaeology, a grinding slab is a ground stone artifact generally used to grind plant materials into usable size, though some were used to shape other ground stone artifacts. Some grinding stones are portable; others are not and, in fact, may be part of a stone outcropping. Grinding slabs used for plant processing typically acted as a coarse surface against which plant materials were ground using a portable hand stone, or mano. Portable grinding slabs are referred to as metates or querns. Like all ground stone artifacts, grinding slabs are made of large-grained materials such as granite, basalt, or similar tool stones.
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