Bluestone is not a technical geologic term. bluestone – a dense, hard, fine-grained, commonly feldspathic sandstone or siltstone of medium to dark or bluish-gray color that splits readily along original bedding planes to form thin slabs.bevel – when the angle between two sides is greater or less than a right angle.belt course – a continuous horizontal course of flat stones placed in line marking a division in the wall plane.(2) In stratified rocks the unit layer formed by semidentation of variable thickness, and commonly tilted or distorted by subsequent deformation generally develops a rock cleavage, parting, or jointing along the planes of stratification. Sometimes applied also to the surface of parting between sheets. (1) In granites and marbles, a layer or sheet of the rock mass that is horizontal, commonly curved and lenticular as developed by fractures. bed – the top or bottom of a joint, natural bed surface of stone parallel to its stratification.basalt – a dense-textured (aphanitic), igneous rock relatively high in iron and magnesia minerals and relatively low in silica, generally dark grey to black, and feldspathic a general term in contradistinction to felsite, a light-colored feldspathic and highly siliceous rock of similar texture and origin.banker – bench of timber or stone on which stone is shaped.
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balustrade – an ornamental fencing consisting of a series of balusters supporting a handrail or molding.baluster – a miniature pillar or column supporting a rail, used in balustrades.back arch – a concealed arch carrying the backing of a wall where the exterior facing is carried by a lintel.