What is mica? Detailed answer

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What is mica? Detailed answer

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What is mica?

You probably came across a piece of mica more than once, which you easily broke into pieces. You may have called it "gelatin".

Mica is a mineral. The term "mica" includes a whole family of rock minerals, which includes muscovite, flugopite, biotite and lepidolite. Since it is difficult to pronounce their names, you will understand why we call all these minerals "mica".

All of these minerals are very similar, although they contain different metals. All types of mica are easily separated into layers. They are soft, even nail marks remain on their surface. All of them form the same type of crystals. They are colorless, yellow, green, red, brown and black.

Mica occurs in rocks in the earth's crust. They are part of the rocks of volcanic origin, which were formed during the cooling of molten lava. In some cases, mica has evolved from other minerals through a process called "metamorphism", that is, changes caused by pressure, heat, and exposure to water.

Mica is mined in mines. The most important mica mining areas are the USA, Canada, India, Madagascar, Russia, Brazil and South Africa.

For industrial use, mica is stratified and cut into the required pieces. Mica is a good insulator and does not conduct heat or electricity. It is clear that mica is widely used in the manufacture of electrical equipment and fire-resistant materials. You have mica at home in the iron and other electrical appliances.

Do you know that before the invention of glass, mica was inserted into the windows?

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

When did surfing originate?

Surfing is a sport where you swim on the ocean waves while standing on a long and narrow board. This sport is enjoyed along the coasts of the world. It has become very popular, but we still think of it as something new. In fact, it is a very ancient sport. It originated in the Pacific Islands hundreds of years ago.

When Captain James Cook discovered Hawaii in 1788, surfing was very popular among the Hawaiians. Hawaiians held surfing competitions, the winners received prizes and were cheered by everyone. The islanders used boards 4-5 meters long and weighing 68 kg.

In 1957 there was a big event in surfing that made it popular. We started using lighter boards. The boards, about 3 meters long and weighing about 10 kg, made surfing possible for women and children. New boards were usually made of foam, covered with fiberglass and rubber.

The board is the only equipment required for this sport. Being on the waves, the athlete stands on the board and controls it to the left and right. First, the athlete must sail away from the shore with the board - beyond the surf, beyond the line where the waves begin to break. Kneeling or lying prone on the board, he waits for the dead swell. When the wave he wants to climb begins to rise above him, he begins to row quickly towards the shore. The wave rises under him, and the board rises to its crest. Having "caught" the wave, the athlete stands up, one foot in front, and controls the board, trying to stay on the wave.

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