a. A wedge-shaped piece of wood used to tighten timber sets against the roof and sides. See also: lag; lid. Nelson b. A tapered piece of material used to initiate the deflection of a borehole. See also: deflecting wedge; Hall-Rowe wedge. Long c. Tapered piece of core that tends to bind and block a core barrel. Long d. A piece of mica that, on splitting, yields pieces thicker at one end than at the other. Skow e. The shape of a stratum, vein, or intrusive body that thins out; specif. a wedge-shaped sedimentary body, or prism. See also: prism Source: Dictionary of Mining, Mineral, and Related Terms
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