How is Black Granite made
Dark to black natural stones are very much in the trend of modern living room design
This also includes black granite. However, due to its composition, black granite basically only contains light to dark minerals in combination. The proportionally dark minerals are originally only up to approx. 5% in the stone. It is precisely this mixture in blue-white, greenish, the characteristic white-gray or pink shades that ultimately make it attractive. A look at the development process shows the interest in black granite.
Within the earth’s crust, at a depth of at least two kilometers, rock melts below the surface of the earth to granite. Granite is also called plutonic as a deep rock. But before this process begins, magma chambers accumulated over a period of approximately 10 to 15 million years. The collected granitic magma needs atmospheric pressure and a melting temperature of around 960 ° C to form crystals. The dark minerals have a higher density and solidify first. Minerals like quartz and feldspars follow.
This changeable process of melting and solidifying various minerals with different densities is called magmatic differentiation and creates a characteristic picture of granite. The end product is extremely hard.
Visible Minerals determine the look
Granite and black granite contain quartz and orthoclase feldspar. There is also zircon, muscovite, apatite, tourmaline, and other minerals. Albite and quartz, in particular, are the bright minerals that are contained in the granite due to the formation process. For this reason alone, black granite can never be black. Black granite can be found as a natural stone in the trade, has similar structures to the original granite. The extreme hardness and the intermingled batches play a central role. They are the crucial point for the high quality that the granite generally brings. Another important factor is the unique usage properties that the raw material granite has. When used as a floor tile, this natural stone is durable, extremely robust and resistant. The raw material granite is often colored dark to black as a design element and, in the end, creates black granite, a very attractive product that creates a luxurious effect with shimmering minerals without suffering any loss in quality.
The plutonic stone used as black granite
The anorthosite, for example, is also a plutonic rock and has similar density and hardness structures to the granite. The mixture of crystals and minerals is also present in this natural stone. With a dark gray color, this rock is colored after mining and comes on the market as black granite.
What you don’t know about Granite
Whether black marble or black granite – dark natural stones (also in dark gray) are the trends. No wonder that black granite is particularly popular: the technical properties of this type of natural stone offer enormous advantages.
Black granite does not exist
The term “black granite” is a little misleading: Many rocks that are dark or black in color are sold as black granites. They mostly belong to the melanocratic hard rocks, also called melange stones. These have a relatively large volume of dark, so-called mafic minerals, which are very high in magnesium and iron. In addition, the quartz content is less than 20%, and some rocks do not even contain quartz. Granite, on the other hand, is extremely rich in this mineral! Another contrast: Granite is one of the leukocratic rocks, which are the counterpart to melamine rocks and therefore have a particularly low proportion of mafic minerals. Black granite is a contradiction in terms and cannot exist in the form!
But why are so many different rocks sold as black granite at all? On the one hand, this designation makes sales easier: Customers who are looking for a black natural stone with a crystalline, interlocking structure are primarily interested in the look. So you will also be satisfied with a black basalt or limestone. On the other hand, “black granite” promises a number of desirable properties: granite is known to be very robust. It defies wind and weather and, like many other types of natural stone, is not sensitive to acid. The term “black granite” suggests to the customer resilience and quality. And that’s exactly where the problem lies. Customers who do not follow up on their own can be deceived. Black granite is not just black limestone. That would be unpleasant when cleaning and maintaining granite at the latest: limestone is sensitive to acid, its surface would be destroyed by the use of certain cleaning agents.