What are the stone introductions of black granite?

Basalt

Basalt is black granite and is one of the important rock types. The color is mostly black or gray-black, and it is fine-grained and dense. 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.

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. It is easy to distinguish. Basalt is the most widely distributed igneous rock. Most basalts are formed when a volcanic eruption occurs. After the magma is ejected, it encounters cold air and rapidly solidifies with the flow of the lava. Some basalts are intrusive rocks. When the volcano erupted, the magma did not erupt. It emerges from the surface and solidifies 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 black granite of 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 the best. Similar Varieties, as well as Fengzhen, Heihe, Hebei, Pingshan, Evergreen, etc. Some Shanxi black plates have some golden dots 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 Black stone with gold dots and reasonable price, inspected for quality and not stained, then you will get a good deal. Be very careful when you are selling Shanxi black grade B. It is not available for export , because of its poor luminosity after surface polishing, it is not widely used abroad.