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Muscovite (also known as common mica, isinglass, or potash mica) 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).
The Principality of Moscow [4] [5] or Grand Duchy of Moscow [6] [7] ( Russian: Великое княжество Московское, romanized : Velikoye knyazhestvo Moskovskoye ), also known simply as Muscovy (from the Latin Moscovia ), [8] [5] was a principality of the Late Middle Ages centered on Moscow.
Muscovite is the most common mineral of the mica family. It is an important rock-forming mineral present in igneous, metamorphic, and sedimentary rocks. Like other micas it readily cleaves into thin transparent sheets. Muscovite sheets have a pearly to vitreous luster on their surface.
- Silicate
- Pearly to vitreous
- Transparent to translucent
- White, often sheds tiny flakes
muscovite, abundant silicate mineral that contains potassium and aluminum. Muscovite is the most common member of the mica group. Because of its perfect cleavage, it can occur in thin, transparent, but durable sheets.
- The Editors of Encyclopaedia Britannica
Grand Principality of Moscow, medieval principality that, under the leadership of a branch of the Rurik dynasty, was transformed from a small settlement in the Rostov-Suzdal principality into the dominant political unit in northeastern Russia. Muscovy became a distinct principality during the.
- The Editors of Encyclopaedia Britannica
Muscovite is the most common form of mica. Its name is derived from "Muscovy Glass", which describes thick sheets of transparent mica that were once used as a glass substitute in Russia. Because of Muscovite's abundance, its presence is usually lacking in collections except for it being an accessory mineral to other minerals.
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Often called ‘white mica’, muscovite is the lightest colored mica mineral. Micas are characterized by a crystal structure consisting of aluminum silicate sheets weakly bound together by layers of positive ions (usually potassium, but sometimes sodium).
