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gang saweddescription of the granular surface of stone resulting from gangsawing alone.
gauged or gauginga grinding process to make all pieces of material to be used together the same thickness.
gauging trowelthe gauging trowel is larger than the pointing trowel but smaller than the buttering trowel. tilesetters prefer the 31/4″ x 7″ size.
gillmore needlea device used in determining time of setting of hydraulic cement.
glass mosaic tilestiles made of glass, usually in sizes not over two (2) inches square and 1/4 inch thick, mounted on sheets of paper. usually sheets are twelve (12) inches square.
glass seamdescription of a narrow glass-like streak occurring in stone; a joint plane that has been re-cemented by deposition of translucent calcite in the crack and is structurally sound.
glazea ceramic coating matured to the glassy state on a formed ceramic article. the term glaze also refers to the material or mixture from which the coating is made.  bright glaze. a high-gloss coating with or without color.  clear glaze. a transparent glaze with or without color.  crystalline glaze. a glaze that contains microscopic crystals.  fritted glaze. a glaze in which a part or all of the fluxing constituents are prefused.  mat glaze. a low-gloss ceramic glaze with or without color.  opaque glaze. a nontransparent glaze with or without color.  raw glaze. a glaze compounded primarily from raw constituents. it contains no prefused materials.  semimat glaze. a medium-gloss ceramic glaze with or without color.  speckled glaze. a glaze containing granules of oxides or ceramic stains that are of contrasting colors. 
glaze fitthe stress relationship between the glaze and body of a fired ceramic product.  grouting. process of filling tile joints with grout  glazed ceramic mosaic tile. ceramic mosaic tile with glazed faces. 
glazed interior tilea glazed tile with a body that is suitable for interior use and which is usually nonvitreous, and is not required or expected to withstand excessive impact or be subject to freezing and thawing conditions.
glazed paver tilesee pavers. glazed quarry tile. 
glost firesee fire, glost.
gradea predetermined degree of slope that a finished floor should have.
grade coursebeginning course at the grade level, generally waterproofed with a dampcheck or damp course.
grainthe easiest cleavage direction in a stone. “with the grain” same as “natural bed”. also, particles (crystals, etc.) of a rock.
granitea fine to coarse-grained, igneous rock formed by volcanic action consisting of quartz, feldspar, and mica, with accessory minerals. granite-type rocks include those of similar texture and origin.
granite gneissa foliated crystalline rock composed essentially of silicate minerals with interlocking and visibly granular texture, and in which the foliation is due primarily to alternating layers, regular or irregular, of contrasting mineralogic composition. in general a gneiss is characterized by relatively thick layers as compared with a schist. according to their mineralogic compositions, gneisses may correspond to other rocks of crystalline, visibly granular, interlocking texture, such as those included under the definition of commercial granite, and may then be known as granite gneiss if strongly foliated, or gneissic granite if weakly foliated.
granularhaving a texture characterized by particles that are apparent to the unaided eye. for sedimentary rocks; particles less than 4 inches (10 mm) in diameter and approximately equal in size.
greenstoneincludes stones that have been metamorphosed or otherwise changed so that they have assumed a distinctive greenish color owing to the presence of one or more of the following minerals: chlorite, epidote, or actinolite.
grouta rich or strong cementitious or chemically setting mix used for filling tile joints. 
grout coarseused for wide grout spaces 2″ or more, consists of one part portland cement, two-and-a-quarter to three parts sand, and one to two parts pea gravel. 
grout fineused in narrow grout spaces, consists of one part portland cement and two-and-a-quarter to three parts sand.
grout sawthe grout saw is a saw-toothed carbide steel blade mounted on a wooden handle. it is used to remove old grout. it also is used in patching work. care should be used as it can easily damage adjacent tiles. the carbide steel blade is brittle, and it will shatter if it is dropped or abused. on front of the saw blade is a spring steel tip, used for scraping grout out of corners where the saw blade cannot reach. process of filling tile joints with grout.
grout scrubbing pada nonscratch nylon pad impregnated with abrasive used for cleaning grout off tile. hairline cracking. small cracks of random patter. in an exposed concrete surface.
grout, coloredsee colored grout.
guillotine cutcutting a stone tile, most often slate, by the guillotine method offers a ragged and chipped edge.