Science Fair Project Encyclopedia In 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. The contents of
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