Breed of granite

Breed of granite - granite, syenite, diorite, gabbro, labradorite, monocytes, teshenity, granite, etc., formed by the eruption of magma and its introduction into the voids crust at a considerable depth. As a result of slow cooling of the overlying strata under the pressure of the earth, these rocks are well crystallized and have a strong holocrystalline, usually granoblastic texture.

The texture of granite is massive with a very low porosity, characterized by a parallel arrangement of the mineral components. The magnitude of the grains constituting the rock minerals, there are three structures of granite: fine-grained with grain sizes up to 2 mm, medium - 2 to 5 mm and coarse - more than 5 mm. The grain size strongly affect the properties of the rocks of granite construction: the smaller the grain size, the higher strength characteristics and durability of the rocks.

These rocks are dense, durable, decorative, respond well to polishing, have an extensive range of colors from black to white. For the granite is characterized by bulk density 2.6-2.7 t/m3, the porosity of less than 1.5%. The compressive strength of 90-250 MPa and higher tensile, flexural and shear - from 5 to 10% of this value.

Granite - an igneous rock containing 60-65% feldspar (orthoclase and plagioclase), 20-30% quartz and 5-10% biotite, muscovite, sometimes hornblende. The most common structure of granite is ravnozernistaya. The texture is massive.

The main background color of granite is due to the predominant color of the feldspar - pink, yellow, red, green, gray, etc. High quality decorative and durability of granite and a large granite deposits determine the prevalence of its wide application in various types of construction, monumental architecture.