What are the classifications of 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 age. Well-known brands such as Fuding Black.

Gabbro

Gabbro is also an important rock type of black granite, the color is mostly black, and the color is pure. Some are decorated with white dots on a black background, and the stone varieties are forest green (Hebei, Henan). Greenstone. However, from the perspective of commercial properties, they are all named after granite. Basalt is extrusive rock with darker color. The mineral particles contained are uniform and small, and it is generally difficult to distinguish the species with the naked eye, even with a magnifying glass. easy to distinguish.

diabase

Dolerite, a shallow facies rock of basic intrusive rock, 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 black granite with good quality 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 actual mineral composition: about 50% plagioclase, polymorphic twin crystal development; 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 excellent. Similar varieties , and Fengzhen, Heihe, Hebei, Pingshan, Wannianqing, etc. Some Shanxi black plates have some golden spots on the polished surface. Many manufacturers do not like them, so the price of this quality plate will be relatively low. If you like this kind of belt Black stone with golden dots, and reasonable price, quality inspection, not dyed, then you will buy a good deal. When you are selling Shanxi black B grade, you have to be very careful. It is not available for export, Because of its poor luminosity after surface polishing, it is not widely used abroad.