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Medusa Stonemasonry

 

Glossary

Antique Finish

A finish that replicates rusticated or distressed textures to make the stone look aged

Brushed Finished

Obtained by brushing the stone with abrasive brushes. The finish is rustic and has good slip resistance.

Bullnose

A term used to describe the rounded edges often found on counter tops, stairs, steps, tiles and masonry units.

Chamfer

To cut away the edge where two surfaces meet in an external angle – also known as a bevel

Granite

A very hard, coarse-grained, igneous rock composed chiefly of feldspar and quartz. Grey to pink in colour, it is believed to have solidified from magma (molten rock) under pressure. Ideal for kitchen worktops and bathroom vanity units.

Honed

A very fine smooth finish on stone with little or no gloss as it is the last step before polishing. Honed finishes are recommended for commercial floors.

Igneous

One of the three classes of rock. Igneous refers to rock that has solidified from magma (molten minerals). Rock formed from shallow magma is called intrusive e.g. Granite and rock formed from deep magma is called plutonic.

Limestone

A sedimentary rock composed mostly of calcium carbonate. Like most other sedimentary rocks, limestones are composed of grains, the majority being made up from skeletal fragments of marine organisms. Other limestones are formed completely by the precipitation of calcium carbonate or aragonite and do not contain grains. These are called Travertine. Limestones can be used for counter tops, flooring and landscaping.

Marble (Commercial)

A metamorphic rock composed predominately of calcite, dolomite or serpentine. The characteristic veining in marble is due to various mineral impurities such as sand, iron oxides or clay.

Metamorphic

One of the three classes of rock.

Onyx

A silaceous rock that occurs in the form of chalcedony (minute quartz crystals that cannot be seen with the naked eye).

Polished

This is a fine smooth finish used on hard, dense materials such as granite and marble. The glossy finish enhances the full character and colour of the stone and is achieved by using fine abrasives until the stone surface is reflective. Polished surfaces are used mainly in kitchens and bathrooms as they are easy to keep clean.

Quartz

A crystalline form of silicon dioxide. One of the most common minerals and the main constituent of quartz-based stone and granite. Quartz is the main constituent of sand and sandstone and an important constituent of many other stones.

Riven

This is a surface finish often used for outdoor paving and refers to the way solid blocks of stone are split, leaving the natural textured face to the slab.

Sandstone

Sandstones are sedimentary rocks composed mostly of sand-sized minerals or rock grains of feldspar and quartz. There are many different colours and textures of sandstone, the colour often being determined by the geographical location. The most common colours are browns, yellows, greys, whites and reds. Sandstones are used as building or paving material.

Sedimentary

One of the three classes of rock. Sedimentary rock is formed from the accumulation of minerals compacted by the action of water, wind and ice. 70% of the earth’s rock is sedimentary. It takes thousands of years for sedimentary roc k to form. Limestone and Limestone are sedimentary.

Slab

A lengthwise cut from a large quarried block of stone. Slab can also be referred to as a flat, thin piece of dressed stone.

Slate

A very fine-grained metamorphic rock derived from sedimentary clay and shale. The slate possesses a cleavage that allows it to be split into thin smooth slabs. Mostly grey in colour, slate is used for patios and walkways, sinks and tabletops.

Travertine

A variety of limestone deposited by chemical precipitation from calcareous (containing lime) springs. Many buildings of ancient and modern Rome are built of travertine.

Tumbled

A weathered, ageing, finish used on marble and limestone. This finish is obtained by rotating pieces of pre-cut stone in a special tumbler that rounds the edges and arrases of the stone. A lubricant and abrasive grit is added to the tumbler to give the stones a smooth, polished finish. Tumbled stone is excellent for non-slip floors and paving, landscaping, driveways, paths and fireplaces.

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