Introduction to black granite

Basalt

Basalt is black granite and is one of the important rock types. The color is mostly black or gray-black, fine-grained and dense block. Its compressive strength is about 3500-5000kg\/cm2, and it has strong acid resistance, abrasion resistance and compression resistance. , Insulation performance. Basalt is widely distributed in my country, and has been produced in almost every geological period. Well-known brands such as Fuding Black.

Gabbro

Gabbro is also an important rock type of black granite. The color is mostly black and pure. Some parts are decorated with white dots on a black background. The stone types are forest green (Hebei, Henan). Greenstone. But from the perspective of commercial properties, they are all named after granite. Basalt is extrusive rock with darker color. The mineral particles contained are average and small, and it is difficult to distinguish the type with the ordinary naked eye, even with a magnifying glass. It is easy to distinguish. Basalt is a widely distributed igneous rock. Most basalt is formed when a volcano erupts, and after the magma is ejected, it encounters cold air and solidifies rapidly with the lava activity. Some basalt is intrusive rock. It spewed out of the surface and was formed when it cooled and solidified in the interior of the earth.

diabase

Dolerite, a shallow facies rock of basic intrusive rocks, is also an important rock type of black granite in China. Black and Indian black are comparable to or even better than them. According to research, the main rock type of Shanxi black is diabase, the so-called Shanxi black A. In China, the high-quality black granite is Shanxi black A grade, and the price is higher than Any black granite produced in India is high. Shanxi Black A contains the following practical mineral components: about 50% plagioclase, with polymorphic twins developed; ordinary-volatile pyroxene about 35%; a small amount of feldspar , about 5 percent; a small amount of minerals include amphibole, biotite, titanomagnetite, etc. According to the structure, it can be subdivided into three brands: large flower, medium flower and fine flower, and medium fine flower is better. Similar There are some types of black plates in Fengzhen, Heihe, Hebei, Pingshan, Evergreen, etc. Some Shanxi black plates have some golden spots on the polished surface. Many consumers do not like them, so the price of plates of this quality will be relatively low. If you like this kind of plate Black stone with gold dots, reasonable price, good quality inspection, not dyed, then you will get a good deal. Be very careful when you sell Shanxi black B grade. It is not available for export , Because of its poor luminosity after polishing, it is not widely used abroad.

pure black hemp

The first misunderstanding about pure black hemp: all pure black hemp granite is the same material. In fact, they may be very different in color, quality and price.

About pure black hemp, everyone knows Sutareboda, a black granite from Sweden. This mineral has been developed for several years. Generally speaking, black granite in Sweden is a stone called ebony. This This kind of stone is very hard and durable. After polishing, hitting it with a hammer or chisel can make a metallic clanging sound. Of course, this stone is also expensive.