Muscovite

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Muscovite
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(No Transcript)
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Musocvite

• Chemistry KAl2(AlSi3O10)(F, OH)2, Potassium
  aluminum silicate hydroxide fluoride.
• Class Silicates
• Subclass Phyllosilicates
• Group Micas
• Uses heat and electrical insulator for
  industrial purposes.

http//www.galleries.com/minerals/silicate/muscovi
t/muscovit.htm
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Physical Properties

• Color is white, silver, yellow, green and brown.
• Luster is vitreous to pearly.
• Transparency crystals are transparent to
  translucent.
• Crystal System is monoclinic 2/m
• Crystal Habits include tabular crystals with a
  prominent pinacoid termination. Muscovites four
  prism faces form diamond shaped "books" and if
  modified by another pinacoid they form
  pseudo-hexagonal crystal "books". The sides of
  the crystal often tend to taper. Also as lamellar
  rock forming masses and small flakes in detrital
  material. Twinned crystals can form flat five
  pointed stars.
• Cleavage is perfect in one direction producing
  thin sheets or flakes.
• Fracture is not readily observed due to cleavage
  but is uneven.
• Hardness is 2 - 2.5.
• Specific Gravity is approximately 2.8 (average)
• Streak is white.
• Associated Minerals are quartz, feldspars, beryl
  and tourmalines.
• Other Characteristics cleavage sheets are
  flexible and elastic, meaning they can be bent
  and will flex back to original shape.
• Notable Occurrences include India, Pakistan,
  Brazil and many USA localities.
• Best Field Indicators are crystal habit,
  cleavage, elastic sheets, color and associations.
  

http//www.galleries.com/minerals/silicate/muscovi
t/muscovit.htm
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Occurrence

• Igneous deposits pegmatites
• Metamorphic mica schists
• Sedimentary

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Uses

• Fireproofing
• Insulating
• Lubricant
• Cosmetics
• Paints and wallpaper

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