• head-banner

Taking you through the rocks – granite

Granite is the most widespread type of rock on the surface. It forms the bulk of the highly evolved continental crust in terms of its chemical composition and is an important marker that distinguishes the Earth from other planets. It holds the secrets of the growth of the continental crust, the evolution of the mantle and crust, and with mineral resources.

In terms of genesis, granite is a deeply intrusive acidic magmatic rock, which is mostly produced as a rock base or strain. It is not difficult to distinguish granite by its appearance; its distinctive feature is its pale, mostly flesh-red colour. The main minerals that make up granite are quartz, feldspar and mica, so very often the colour and lustre of granite will vary depending on the feldspar, mica and dark minerals. In granite, quartz accounts for 25-30% of the total, it has the appearance of a small glass with a greasy sheen; potassium feldspar accounts for 40-45% of the feldspar and plagioclase 20%. One of the properties of mica is that it can be divided into thin flakes with a needle along the deconstruction. Sometimes granite is accompanied by paramorphic minerals such as amphibole, pyroxene, tourmaline and garnet, but this is uncommon or not easily detected.

The advantages of granite are outstanding, it is homogeneous, hard, less water absorption, the compressive strength of the rock block can reach 117.7 to 196.1MPa, so it is often considered a good foundation for buildings, such as the Three Gorges, Xinfengjiang, Longyangxia, Tenseitan and other hydroelectric dams are built on granite. Granite is also an excellent building stone, it has good hardness, and has high compressive strength, small porosity, low water absorption, fast thermal conductivity, good wear resistance, high durability, frost resistance, acid resistance, corrosion resistance, not easy to weather, so it is often used to build bridge piers, steps, roads, but also for masonry houses, fences and so on. Granite is not only strong and practical, but also has a smooth surface with neat angles, so it is often used in interior decoration and is considered a high-grade decorative stone.

Granite is not a single rock type, but has many variants, each of which displays different properties depending on the substances in which it is mixed. When granite is mixed with orthoclase, it usually appears pink. Other granites are grey or, when metamorphosed, dark green.

Post time: May-30-2023