Granite: Its physical, geochemical general properties

Alister Cruickshanks (UK) Granite rocks are igneous rocks that were formed by slowly cooling pockets of magma that were trapped beneath the earth’s surface. Granite is used all over the world in the construction industry due to its unique properties and versatile range of colours and textures. One common characteristic of granite is it has a visible crystalline texture formed of quartz and orthoclase or microcline. Quartz makes up 10% to 60% of the composition, with feldspar accounting for between 65% and 90% and biotite between 10% and 15%. As a result, its hardness makes it not only ideal for building construction, but also for sea and river defences. Fig. 1. Adamellite granite. As a building material, granite is often used for cladding walls, and for roofing and flooring, with a range of other interior and exterior applications. In this respect, one of the biggest advantages it has is its hardness. In fact, granite is actually the hardest building stone available and leads to excellent wear. On the Mohs hardness scale, granite is between 5 and 8, with an abrasive hardness of 37 to 88. Its density can range between 2.54 to 2.66g/cc. Fig. 2. A beautiful grey granite. It is also impermeable with a porosity ranging from 1e-009 and 1e-006. Another important property is it is highly thermally stable, showing no alteration with changes in temperature, which provides excellent fire protection. It is also often used in the construction of tanks for storing caustic material simply because it is … Read More

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