Micas (/ ˈmaɪkəz / MY-kəz) are a group of silicate minerals whose outstanding physical characteristic is that individual mica crystals can easily be split into fragile elastic plates. This characteristic is described as perfect basal cleavage.

2025年3月2日 · Mica, any of a group of hydrous potassium, aluminum silicate minerals. It is a type of phyllosilicate, exhibiting a two-dimensional sheet or layer structure. Among the principal rock-forming minerals, micas are found in all three major rock varieties—igneous, sedimentary, and metamorphic.

2023年4月23日 · Properties of Mica Group Minerals. The rock-forming micas (other than glauconite) can be divided into two groups: those that are light-coloured (muscovite, paragonite, and lepidolite) and; those that are dark-coloured (biotite and phlogopite).

2024年1月19日 · Mica refers to a group of silicate minerals renowned for their remarkable ability to be split into thin, elastic sheets. This attribute, known as perfect basal cleavage, sets mica apart in the...

Mica, which is essentially a compound of silicate minerals, is comprised of closely related materials that have perfect basal cleavage. They belong to the category of principal rock-forming minerals and are found in various categories like sedimentary, igneous, and metamorphic.

Mica is a mineral name given to a group of minerals that are physically and chemically similar. They are all silicate minerals, known as sheet silicates because they form in distinct layers. Micas are fairly light and relatively soft, and the sheets and flakes of mica are flexible.

The mica group represents 37 phyllosilicate minerals that have a layered or platy texture. The commercially important micas are muscovite and phlogopite. Layering in the univalent (potassium, sodium), or true, micas imparts perfect basal cleavage, allowing crystals to be split into very thin sheets that are tough and flexible.

Here, we shall tell you about the properties and uses of the mineral mica. Properties of Mica Physical. Mica is translucent and optically flat. It displays basal cleavage, which means that it splits along planes parallel to the base. It can be beaten into thin sheets, and is …

2017年8月31日 · The general formula for the mica minerals is XY 2-3 [(Si,Al) 4 O 10](OH,F) 2, where X = K,Na,Ca and Y = Mg,Fe,Li,Al. Their molecular makeup consists of double sheets of strongly joined silica units (SiO 4 ) that sandwich between them a …

2025年3月2日 · Micas occuring as large crystals are often called books; these may measure up to several metres across. In most rocks, micas occur as irregular tabular masses or thin plates (flakes), which in some instances appear bent.