A species of Biotite, Also known as Brown Mica, Hydroxyl-Phlogopite, Magnesian Biotite
Phlogopite is incredibly brittle, yet it develops in impressively large mica sheets. These large sheets are so fragile that when they come into contact with anything, including water, they will crumble. This delicate nature makes it is a perfect mineral for use as insulation in electronic devices. Although you may not know it, your car's spark plugs very likely contain phlogopite!
Hardness:
2 - 3
Density:
2.79 g/cm³
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Properties
Values
Characteristics
Cultural
Common Questions
General Info About Phlogopite
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Physical Properties of Phlogopite
Luster
Pearly, Vitreous
Diaphaneity
Transparent to translucent
Colors
Brown, gray, green, yellow, reddish brown
Magnetism
Non-magnetic
Tenacity
Flexible
Cleavage
Perfect
Fracture
Micaceous
Streak
White
Crystal System
Monoclinic
Hardness
2 - 3 , Extremely soft to Soft
Density
2.79 g/cm³, Normal Weight
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Chemical Properties of Phlogopite
Chemical Classification
Silicates
Formula
KMg3(AlSi3O10)(OH)2
Elements listed
Al, H, K, Mg, O, Si
Common Impurities
Mn, Ba, Cr, Na, Ti, Ni, Zn, Ca, Li, Rb, H2O
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Rarity
Rare
Characteristics of Phlogopite
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Formation of Phlogopite
Phlogopite is an important and relatively common end-member composition of biotite. Phlogopite micas are found primarily in igneous rocks, although it is also common in contact metamorphic aureoles of intrusive igneous rocks with magnesian country rocks and in marble formed from impure dolomite (dolomite with some siliclastic sediment).
Cultural Significance of Phlogopite
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Uses of Phlogopite
Phlogopite is one of two mica materials used industrially. Although it is used less commonly than muscovite due to its comparative rarity, it still has a variety of applications. Phlogopite is added to plastic car parts to increase stiffness. It is also used to insulate different electrical products, make spark plugs, and as a substitute for asbestos.
Distribution of Phlogopite
The largest documented single crystal of phlogopite was found in Lacey mine, Ontario, Canada; it measured 10x4.3x4.3 m³ and weighed about 330 tonnes. Similar-sized crystals were also found in Karelia, Russia.
Healing Properties of Phlogopite
Phlogopite works on the Third Eye and Crown chakras to provide clarity of vision and encourage innovative ideas. It allows its user to cut through insignificant details and provides a clearer picture of every issue, so it can be quite beneficial in the office. It enhances visions of the Third Eye chakra and brings better understanding between the physical and spiritual worlds.
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