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The Stone & Worktop Glossary


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The jargon used in defining stone terms can often become quite convoluted. The purpose of this section is to try to offer a clear explanation, in layman’s English, of the most common definitions relating to stone, worktops as a whole and their fabrication.

If you are looking for an explanation of a term not contained here please feel free to contact us and we will be happy to try to assist you.

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Stone And Worktop Terms Beginning With The Letter G


An igneous coarse stone composed chiefly of pyroxene, augite or diallage, and plagioclase.


The outside triangular section of a wall extending up from the level of the eaves to the apex. Also, a part resembling the triangular end of a roof.


A stone chip or spall.

Gang Saw

Can be called a frame saw.

Gang Sawed

Description of the coarse surface of stone resulting from gang sawing.

Gantry Saw

A typically one diamond blade saw with a portable rail and blade that can be repositioned the length of its tracks between cuts.


The insertion of small splinters of stone in the mortar joints before the mortar has securely set.

Gauged Or Gauging

A grinding procedure to make all parts of material to be used together the same depth.

Glass Seam

Description of a narrow glass-like streak taking place in stone. It is a joint plane that has been recommended by deposition of translucent crystalline calcite in the crack and is usually structurally sound.


Luster or mirror like finish, measured as light reflectance.


A metamorphic rock with a banded or coarsely foliated arrangement, frequently called “Trade Granite”. Composed fundamentally of silicate minerals with interlocking and noticeably granular texture in which the foliation is due primarily to alternating layers, regular or irregular, of contrasting mineralogical composition.

Grade Course

Commencement course at the grade level, usually waterproofed with a damp check or damp course.


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


A  hard, crystalline, igneous rock, gray to pink in colour, composed of feldspar, quartz, and lesser amounts of dark ferromagnesian materials. Black “granites” are alike to true “granites” in configuration and texture, but are composed of different minerals.

Granite Gneiss

a foliated crystalline rock composed manly of silicate minerals with interlocking and noticeably granular texture, and in which the foliation is due primarily to alternating layers, regular or random, of contrasting mineralogical composition. In common relatively deep layers as compared with schist characterize gneiss. According to their mineralogical compositions, gneisses may correspond to other rocks of crystalline, noticeably 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.


Stones have a texture characterized by particles that are noticeable to the unaided eye. For sedimentary rocksparticles less than 4 inches in diameter and roughly equal in size.


Composed chiefly of quartz, but may contain granite, limestone, basalt, and others.


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

Green Mortar

Mortar that has set but not dried.


Includes stones that have been metamorphosed or likewise altered that they have assumed a distinctive greenish colour due to the presence of one or more of the following minerals chlorite, epidotic, or antimonite.

Grit Finish

A smooth non-reflective finish mainly used on marble and limestone marble.


Crushed brick that is mixed with clay to form a new brick.

Group Classification for Soundness

Standard trade exercise definitions setting forth extent of shop fabrication normally necessary for group A,B, C, and D marbles.


A blend of cement material and aggregate to which sufficient water is added to make a pouring consistency without segregation of the constituents.

Grout Core Masonry

Masonry creation made with unfilled 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 hollow without stopping; an increment of the total grout pour.

Grout Pour

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

Grouted Masonry

Masonry creation made with solid masonry in which the interior joints and voids are filled with grout.

Guide Specification

A recommended specification for the furnishing and fitting of construction stone.


A rope or wire which, with others, stops a post or derrick from having side sway.


A hydrated calcium sulphate. It is formed in nature as the result of the reaction of sulphuric acid formed by decomposition of pyrite upon the calcium carbonate of shells existing in clay; a sedimentary rock.

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