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1. a type of chisel with a blade that has a concavo-convex section
2. Geology a fine deposit of rock fragments, esp clay, occurring between the walls of a fault or mineral vein
A curved chisel for wood, bone, stone, and so on.
Soft, pulverized mixture of rock and mineral material found along shear (fault) zones and produced by the differential movement across the plane of slippage.
A layer of soft material along the wall of a vein which favors miners by enabling them, after gouging it out with a pick, to attack the solid vein from the side.
1. A chisel with a longitudinal curved blade, used to cut holes, channels, or grooves in wood or stone.
2. A form of wear in resilient floor coverings which is accompanied by removal of material and penetration considerably below the immediate floor surface.