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Specifically, mica is unusual in that it is a good electrical insulator at the same time as being a good thermal conductor. The leading use of block mica is as an electrical insulator in electronic equipment.
Muscovite (also known as common mica, isinglass, or potash mica [6]) is a hydrated phyllosilicate mineral of aluminium and potassium with formula KAl 2 (AlSi 3 O 10)(F,OH) 2, or 2 (Al 2 O 3) 3 (SiO 2) 6 (H 2 O). It has a highly perfect basal cleavage yielding remarkably thin laminae (sheets) which are often highly elastic.
Kirazuri (雲母摺り) is a method used in Japanese woodblock printmaking using mica powder, or 雲母 (kira) to add sparkle. When used for the background in portraits, depending on the base color, it is called Shiro-kirazuri (white), Kuro-kirazuri (literally black, but dark gray practically), and Beni-kirazuri (red). [1]
The most usual source of pearlescence is the natural mineral mica covered by a thin layer of titanium dioxide. This coating causes goniochromism – the color appears through interference effects with the naturally translucent mica, and varying the thickness of the titanium dioxide changes the color. [8]
Mica powders, iron oxides and clays can give color pigments to eye shadows. [13] Binders help eye shadow adhere and stay attached to skin. Eye shadows can have dry or liquid binders. Zinc and magnesium, which are both white powders, are commonly used as dry binders. Zinc also adds color and can be used to increase the thickness of the eyeshadow.
Mica is resilient, reflective, refractive, dielectric, chemically inert, insulating, lightweight, and hydrophilic. [1] Alternatively, aluminium or bronze powder may be used. To make the "hammered" effect more pronounced, a small amount of silicone oil may be added directly before application.
Mica. Glittering surfaces have been found to be used since prehistoric times in the arts and in cosmetics. The modern English word "glitter" comes from the Middle English word gliteren, possibly by way of the Old Norse word glitra. [10] However, as early as 30,000 years ago, mica flakes were used to give cave paintings a glittering appearance. [1]
Sericite also occurs as the fine mica that gives the sheen to phyllite and schistose metamorphic rocks. The name comes from Latin sericus , meaning "silken" in reference to the location from which silk was first utilized, which in turn refers to the silky sheen of rocks with abundant sericite.
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