Granite is one of the most popular building materials. It has been used for thousands of years in both interior and exterior applications. Granite dimension stone is used in buildings, bridges, paving, monuments and many other exterior projects. Indoors, polished granite slabs and tiles are used in countertops, tile floors, stair treads and many other design elements. Granite is a prestige material, used in projects to produce impressions of elegance and quality. Some interesting uses of granite are shown below.
What is "Granite"?
The definition of "granite" varies. A geologist might define granite as a coarse-grained, quartz- and feldspar-bearing igneous rock that is made up entirely of crystals. However, in the dimension stone trade, the word "granite" is used for any feldspar-bearing rock with interlocking crystals that are large enough to be seen with the unaided eye. By this classification, rocks such as anorthosite, gneiss, granite, granodiorite, monzonite, syenite, gabbro and others are all sold under the trade name of "granite".
Granite Physical PropertiesIn 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 StabilityGranite 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 expansionThe co-efficient of expansion for granite varies from 4.7x10-6 9.0x10-6(inch x inch).
Variegation Granite shows consistency in colour and texture.
Granite is one of the most popular building materials. It has been used for thousands of years in both interior and exterior applications. Granite dimension stone is used in buildings, bridges, paving, monuments and many other exterior projects. Indoors, polished granite slabs and tiles are used in countertops, tile floors, stair treads and many other design elements. Granite is a prestige material, used in projects to produce impressions of elegance and quality. Some interesting uses of granite are shown below.
What is "Granite"?
The definition of "granite" varies. A geologist might define granite as a coarse-grained, quartz- and feldspar-bearing igneous rock that is made up entirely of crystals. However, in the dimension stone trade, the word "granite" is used for any feldspar-bearing rock with interlocking crystals that are large enough to be seen with the unaided eye. By this classification, rocks such as anorthosite, gneiss, granite, granodiorite, monzonite, syenite, gabbro and others are all sold under the trade name of "granite".
Granite Physical PropertiesIn 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 StabilityGranite 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.
Hardness It is the hardest building stone and hardness of granite that lends it excellent wear.
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 oxidesSilica (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%
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