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GABBRO
An igneous granular stone composed chiefly of pyroxene, augite or diallage, and plagioclase

GABLE
The exterior triangular section of a wall extending upward from the level of the eaves to the apex. Also, a member resembling the triangular end of a roof

GALLET
A stone chip or spall

GANG SAW
A machine with multiple blades used to saw rough quarry block into slabs. Also known as a frame saw

GANG SAWED
Description of the granular surface of stone resulting from gang sawing alone

GANTRY SAW
A usually single diamond blade saw with a mobile rail and blade that can be repositioned along its tracks between cuts

GARRETING
The insertion of small splinters of stone in the mortar joints before the mortar has firmly set

GAUGED
(Gauging) A grinding process to make all pieces of material to be used together the same thickness

GLASS SEAM
Description of a narrow glass-like streak occurring in stone. It is a joint plane that has been re-cemented by deposition of translucent crystalline calcite in the crack and is usually structurally sound

GLOSS
Luster or shininess, measured as light reflectance

GNIESS
A metamorphic rock with a banded or coarsely foliated structure, often called ’Trade Granite’. Composed essentially of silicate minerals with interlocking and visibly granular texture in which the foliation is due primarily to alternating layers, regular or irregular, of contrasting mineralogical composition

GRADE COURSE
Beginning course at the grade level, generally waterproofed with a damp check or damp course

GRAIN
The easiest cleavage direction in a stone. Also the particles (crystals, sand grain, etc.) in a stone

GRANITE
A very hard, crystalline, igneous rock, gray to pink in color, composed of feldspar, quartz, and lesser amounts of dark Ferro magnesium materials. Black ’granites’ are similar to true ’granites’ in structure and texture, but are composed of different minerals

GRANULAR
Stones having a texture characterized by particles that are apparent to the unaided eye. For sedimentary rocks: particles less than 4 inches in diameter and approximately equal in size

GRAVEL
Composed chiefly of quartz, but may contain granite, limestone, basalt, and other rocks

GREEN MORTAR
Mortar that has set but not dried

GREENSTONE
Includes stones that have been metamorphosed or otherwise altered that they have assumed a distinctive greenish color owing to the presence of one or more of the following minerals: chlorite, epidote, or actinolite

GREYWACKE
A grainy conglomerate stone composed of firmly cemented fragments of quartz

GRIND-IN-PLACE INSTALLATION
Method of installation of stone floors by which all components (tiles or cuts of stone) are set on “mud” and then ground and finished in the premises

GROG
Crushed brick that is blended with clay to form new brick

GROUT
A mixture of cement material and aggregate to which sufficient water is added to produce pouring consistency without segregation of the constituents

GROUT CORE MASONRY
Masonry construction made with hollow units in which all or specific cores are filled with grout

GROUT LIFT
The height to which grout is placed in a cell, collar joint or cavity without stopping; an increment of the total grout pour

GROUT POUR
The total height of a masonry wall to be grouted prior to the placement of additional masonry. A grout pour may consist of one or more grout lifts

GROUTED MASONRY
Masonry construction made with solid masonry in which the interior joints and voids are filled with grout

GUIDE SPECIFICATION
A recommended specification for the furnishing and installation of building stone

GYPSUM
A hydrated calcium sulfate. It is formed naturally as the result of the reaction of sulfuric acid produced by decomposition of pyrite upon the calcium carbonate of shells existing in clay; a sedimentary rock