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About mica
Phlogopite

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Phlogopite is a rarer member of the mica group and is not well known even by mineral collectors. It has been mined however for its heat and electrical insulating properties which are considered superior to other micas. The typical light brown color of phlogopite is characteristic although it is difficult to distinguish brown biotite from dark brown phlogopite. The two are actually end members in a series that is dependent on the percentage of iron. Phlogopite is iron poor and biotite is iron rich. The darker color and density increase with an increase in the iron content. Biotite tends to form in a wider range of conditions than phlogopite which is limited mostly to ultramafic rocks and magnesium rich marbles and pegmatites.

Phlogopite, like other micas, has a layered structure of magnesium aluminum silicate sheets weakly bonded together by layers of potassium ions. These potassium ion layers produce the perfect cleavage. Phlogopite is rarely considered a valuable mineral specimen, but well formed crystals are rare and some are now on the market showing nice crystals. These come from the Kola Pennisula area of Russia. Single large plates or "books" of phlogopite can grow to considerable size.




  • Phlogopite
    more
    details
  • Crystallography
    details
  • MICA
    the Maryland Institute College of Art
    details
  • Mica Lighting .
    http://www.micalamps.com/
    details
  • Phyllosilicate mineral of aluminium and potassium
    http://en.wikipedia.org/wiki/Muscovite
    details
  • Silver mica
    http://www.patentstorm.us/patents/4025829.html
    details
  • MICA-Mineral Information Institute
    http://www.google.com/
    details
  • Biotite
    http://www.britannica.com/EBchecked/topic/66240/biotite
    details
  • Muscovite.
    http://www.mineralszone.com/minerals
    details
  • Mica-aluminum silicate minerals.
    http://www.answers.com/topic/mica
    details
  • Mica Shields
    details
  • Mica Histori & General Information.
    details
  • Muscovite.
    http://itc.gsw.edu/faculty/bcarter/physgeol/min/musc.htm
    details
  • Britannica about mica.
    Asian deposits, chemical etching, compressibility...
    details
  • Micanite.
    details
  • Mineral Muscovite.
    details
  • The Mica Group of minerals
    details
  • Mica - Explanation and use.
    details
  • Mica grouping (chemical composition)
    details
  • Molding micaceous laminate
    details
  • Mica insulation
    details
  • New electric insulating materials
    details
  • SOGM - SMOG
    details
  • Mica and ecology
    details
  • English version (page about mica)
    details
  • Chemical composition of mica
    details
  • Molding micanite, Federal Standard 6122-75
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  • Key trends in mica consumption. Application areas
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  • Mica types, grades and application areas
    details
  • If microwave oven's strip burned out
    details
  • Universal insulating materials
    details
  • Mica-bearing materials list
    details
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