Mica is a very common rock-forming mineral, widely distributed in crystalline rocks. Its general chemical formula can be expressed as:

In addition to electronics, mica is also a critical ingredient in the cosmetics industry. It is commonly found in makeup products, such as eyeshadows, highlighters, and foundation, where it serves multiple purposes. Mica provides a shimmering effect, enhancing the appearance of the skin and creating a luminous finish. Moreover, its absorbent properties help to control oil, making it a popular choice for products designed for oily or combination skin types. As consumers become more conscious of the ingredients in their cosmetics, the demand for natural and mineral-based products has surged, further boosting the mica market.

A group of parallel cleavages can be seen in a photograph of biomica under orthogonal polarized (left) and single polarized (right) mirrors.