Granites are the largest igneous intrusive rock of the continental crust. The name of this natural material comes from the Latin “granum” – grain.
All granites are characterized by high hardness and strength, comprising 6-7 on the Mohs scale. At the same time, the chemical and physical properties of the materials of this group and their internal structure can be very different from each other. What color is granite, what determines its color?
According to the perception of color and texture, all granites are divided into 3 groups: homogeneous, layered and vein. But the color scheme of this natural material is very diverse, this includes many of the most unimaginable shades. Thanks to this, it is a very valuable building and finishing material.
Granite is widely used for the production of mosaics, vases, steps, and slabs for floors, monuments, pavers, stairs.
The main reason for the variegation of granite is the properties of those minerals that make up its composition. Feldspar makes the greatest contribution to the color of granite, which, due to the presence of various impurities in the granite, is painted in various colors. So it can be both milky white and black, although in a chemically pure state it is white.
Traditional, familiar to many, gray color is given to granite by two more components – mica and pyroxene (dark-colored). Red or pink granites are obtained due to the presence of iron oxides in their composition, as well as hematite or red iron crystals included in the stone.
It is noteworthy that the ability to stain granite in these minerals is so great that only 0.2-0.3% of their content in the rock is enough and the color turns pink, and if it reaches 0.8-0.9%, it will change, becoming bright red.
A small amount of amazonite will make granite green. Some deposits can produce beautiful green granite with surface irisation, i.e. low tide. Such granite is sometimes called the peacock’s tail. Violet-pink granite is obtained when amethysts are present in its composition, and the sky-blue color of granite gives the presence of blue quartz.
However, not all granite rocks have unique or more or less remarkable visual characteristics. Among these is pegmatite granite. When making paving stones from it, the pattern on its surface will resemble Hebrew scripts, due to the wedge-shaped germination of quartz and spar crystals in each other.
Apart from gabbro-diabase is black granite, which has a lot of advantages, among which it is worth noting its extraordinary strength, chemical resistance, and maximum water resistance.