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Muscovite also known as common mica, isinglass, or potash mica is a hydrated phyllosilicate mineral of aluminium and potassium. It has a highly perfect basal cleavage yielding remarkably thin laminae which are often highly elastic.
Muscovite has a Mohs hardness of 2–2.25 parallel to the face, 4 perpendicular to the and a specific gravity of 2.76–3. It can be colorless or tinted through grays, browns, greens, yellows, or rarely violet or red, and can be transparent or translucent. It is anisotropic and has high birefringence. Its crystal system is monoclinic. The green, chromium-rich variety is called fuchsite; mariposite is also a chromium-rich type of muscovite.
Muscovite is the most common mica, found in granites, pegmatites, gneisses, and schists, and as a contact metamorphic rock or as a secondary mineral resulting from the alteration of topaz, feldspar, kyanite, etc. In pegmatites, it is often found in immense sheets that are commercially valuable. The sstone is in demand for the manufacture of fireproofing and insulating materials and to some extent as a lubricant.
The name muscovite comes from Muscovy-glass, a name given to the mineral in Elizabethan England due to its use in medieval Russia as a cheaper alternative to glass in windows. This usage became widely known in England during the sixteenth century with its first mention appearing in letters by George Turberville, the secretary of England’s ambassador to the tsar Ivan the Terrible, in 1568.
The following section is pseudo scientific and based on cultural beliefs.
Muscovite controls blood sugar, balances pancreatic secretions, alleviates dehydration and prevents hunger while fasting. It regulates the kidneys. It relieves insomnia and allergies and heals any conditions resulting from dis-ease or distress.
The stone encourage unconditional love, to open the heart to sharing and to help you to accept other peoples imperfections. Practically, it is an excellent stone if you suffer from dyspraxia and have a problem with clumsiness and left-right confusion.