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Granite Information
Granite, the hard igneous rock Granite is a very hard crystalline, igneous or metamorphic rock primarily composed of feldspar, quartz and lesser amounts of dark minerals. It is visibly crystalline in texture. This igneous rock is created deep within the earth from magma, cooled slowly under great pressure. Granite, the hardest building stone has very dense grain which make it impervious to stain. Granite is available in a wide array of colors. varieties of different colors and textures such as black, grey, pink, multi colored etc. Uses It is used as a building material is used for wall cladding, roofing and flooring and a variety of other interior and exterior applications.
Granite Chemical Properties
Granite is primarily composed of feldspar, quartz along with various other minerals in varying percentage,which are stated as follows:
Nominal chemical composition of various oxides
Silica(SiO2) ---------------------- 70-77%
Alumina(Al2O3) ----------------- 11- 14%
Potassium Oxide(P2O5) --------- 3 - 5%
Soda(Na2O) ------------------------ 3 - 5%
Lime ----------------------------------- 1%
Iron(Fe2O3) -------------------------- 1-2%
Iron(FeO) ----------------------------- 1 - 3%
Magnesia(Mg0) ------------------------- .5 - 1%
Titina ---------------------------------- Less than 1%(.38%)
Water(H2O) --------------------------- 0.03%
Granite Physical Properties
In terms of its physical properties granite is a unique material. These properties lending uniqueness to granite are:
Porosity/permeability
Granite has almost negligible porosity ranging between 0.2 to 4%.
Thermal Stability
Granite is highly stable thermally, therefore shows no changes with the change in temperature. Granite is impervious to weathering from temperature and even from the air borne chemicals. It is the high resistance to chemical erosion that makes granite useful for making tanks to store highly caustic material.
Co-efficient of expansion
The co-efficient of expansion for granite varies from 4.7x10-6 - 9.0x10-6(inch x inch).
Variegation
Granite shows consistency in color and texture.
Hardness
It is the hardest building stone and hardness of granite that lends it excellent wear.
Granite Countertops
One of the most familiar uses of granite in the United States is in kitchen countertops. The countertop pictured above was made from a solid slab of granite that was cut to custom shape and edge-finished. Increased demand for granite countertops has inspired a large number of kitchen contractors to acquire the expertise and equipment to install them. As a result they can usually be ordered from and installed by a local dealer instead of a company located hundreds of miles away. For this product, increased demand has actually reduced the installed price to a level that is within reach of the average homeowner. Pictured above is a pink granite kitchen countertop. Granite Tile Sink, Backsplash & Counter
In addition to solid slab countertops, granite tiles can be used to create a colorful and durable work station. The photo above shows how granite tiles were used to create a sink, backsplash and elevated counter Granite Tile Flooring and Wall Panels
Granite tiles are often used as flooring and wall panels to produce an elegant, high-luster space. The stone used for these tiles would be called "gabbro" by geologists but the term "granite" is used in the decorative stone trade - see the box at right for definitions of granite. Granite Building Stone
The building above was built with granite blocks. Granite blocks for construction can be rough on all sides or finished on one or more sides. In this photo, a combination of rough and finished granite surfaces produce an elegant appearance. Note how most of the blocks used in this wall have both rough and finished sides. This yields tightly fitting joints but a rough surface texture. However, blocks used at window sill and roofline levels are finished on all sides. Rough-cut blocks are the least expensive and provide a rugged appearance. Finishing the blocks is expensive but yields a more refined appearance Granite Facing Stone
In large construction projects granite can be used in two different ways: 1) as a structural element, and 2) as decorative facing or veneer. Both of these are shown in the Arlington Memorial Bridge over the Potomac River at Washington, D.C. above. Visible immediately above the water line in this photo are the large rectangular granite blocks that were used in the piers of the bridge. These blocks are a structural use of granite. The visible surface of the bridge above the piers is covered with a thin veneer of facing stone to provide an attractive appearance. Granite Paving Stone
Granite paving stones or "pavers" can make a colorful and interesting way of paving a driveway or patio. The beauty of natural stone, combined with expert craftsmanship and design can produce a unique and lasting result. In the past granite blocks were often used to pave city streets. However, concrete and asphalt have replaced most of this work because of the lower material and construction cost. Granite Curbing
Granite is often used as a street curbing. Curbs made from granite are more durable than those made of concrete. They also provide a more decorative appearance Granite Monument
Granite does not need to be quarried to be used. Mount Rushmore, a granite monument in the Black Hills of South Dakota is a tribute to George Washington, Thomas Jefferson, Theodore Roosevelt and Abraham Lincoln that is carved directly into the mountain. Granite Memorial
Granite is the stone most often used as a grave marker in the United States and many other countries. It is a durable, attractive material, especially when polished. Granite is also the rock type most often associated with "permanence". This psychological association increases the appeal of granite as a memorial stone. Granite Slabs
Projects begin with an idea and a rough piece of rock. If you have read this far you are definitely interested in granite. A trip to a local stone yard might inspire you to enrich your surroundings with some interesting granite features. Granite
Decoration
International Marble and Granite
This company is a stepping stone to becoming a supplier.
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