Black mica is getting popular at present. This is known as the biotite and this is a common silicate mineral. This has shiny surfaces and like the majority of micas, this splits into extremely thin flakes together with its perfect cleavage. Black mica is a type of mineral, which can be found in igneous rocks like granites and metamorphic rocks.Black mica is also said as a sheet silicate. Iron, oxygen, hydrogen, magnesium, and silicon form into sheets that bond together weakly by the potassium ions. This is sometimes known as the iron mica. The reason behind it is that this has more iron in comparison to the phologopite. This was also known asg black mica. It is because to make a difference from white mica.
When it comes to the properties of the black mica, like several mica, this has basal cleavage. It also consists of flexible sheets or lamellae, which flake off quickly. This has a system of monoclinic crystal with tabular as well as prismatic crystal that has pinacoid termination. This has 4 prism face and 2 pinacoid faces to create a pseudohexagonal crystal.Even if this is not seen quickly because of the sheets and cleavage, the fracture is not even. This appears greenish to black or brown and even yellow when this is weathered. This may be also transparent to opaque and has a pearly as well as vitreous luster. There are cases that black mica is found in large chunks. This is called books because of its form that has numerous pages of sheets.
As what was mentioned earlier, black mica is sometimes found in several metamorphic as well as igneous rocks. For example, this occurs in the lava. This is an important phenocryst in several kinds of lamprophyre. This is also found in huge cleavable crystals most particularly in the pegmatite veins like in North Carolina, Virginia, and so on. Some renowned black mica occurrences were also seen in Sudbury and Bancroft. This is also an essential constituent of the metamorphic schists. This makes a good composition under varied pressure and temperature.
Many experts continue their research and studies about black mica because they know that this can be a useful mineral in the future. Currently, there are some companies who turned this into an extract, which can be used in various purposes. So, if you want to try what black mica, never hesitate to consider the black mica extract as this can be useful to anyone.