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Phlogopite information


Phlogopite
General
CategoryMica, phyllosilicates
Formula
(repeating unit)		KMg3(AlSi3O10)(F,OH)2
IMA symbolPhl[1]
Strunz classification9.EC.20
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupC2/m
Identification
ColorBrown, brownish red, dark brown, yellow, yellowish brown, green, white and gray
Crystal habitTabular, scaly masses, rarely perfect phenocryst tablets
TwinningComposition twinning
CleavagePerfect basal (001)
FractureNone
TenacityTough, flexible thin laminae
Mohs scale hardness2–2.5
LusterPearly, sometimes slightly metallic on cleavage surfaces
StreakWhite
DiaphaneityTransparent to translucent
Specific gravity2.78–2.85
Optical propertiesBiaxial (−), 2V=12
Refractive indexnα = 1.530–1.573 nβ = 1.557–1.617 nγ = 1.558–1.618
Birefringenceδ =0.0280–0.0450
2V angle16–20°
Other characteristicsFluorescent
References[2][3][4][5]

Phlogopite is a yellow, greenish, or reddish-brown member of the mica family of phyllosilicates. It is also known as magnesium mica.

Phlogopite is the magnesium endmember of the biotite solid solution series, with the chemical formula KMg3AlSi3O10(F,OH)2. Iron substitutes for magnesium in variable amounts leading to the more common biotite with higher iron content. For physical and optical identification, it has most of the characteristic properties of biotite.

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Mineralienatlas
  3. ^ Phlogopite WebMineral
  4. ^ http://rruff.geo.arizona.edu/doclib/hom/phlogopite.pdf Handbook of Mineralogy
  5. ^ http://www.mindat.org/min-3193.html Mindat

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olivine lamproites is phlogopite macrocrysts and microphenocrysts, together with groundmass micas that vary in composition from phlogopite to "tetraferriphlogopite"...

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series between the iron-endmember annite, and the magnesium-endmember phlogopite; more aluminous end-members include siderophyllite and eastonite. Biotite...

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forsteritic olivine; high iron leucite; titanium-rich aluminium-poor phlogopite; potassium- and titanium-rich richterite; low aluminium diopside; and...

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granite. Minerals occurring with serendibite include diopside, spinel, phlogopite, scapolite, calcite, tremolite, apatite, grandidierite, sinhalite, hyalophane...

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Lamprophyre

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is common) some form of volatile enrichment, to provide the biotite (phlogopite) and amphibole (pargasite) mineralogy lack of fractional crystallisation...

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that the diamondiferous epiclastic rocks range from olivine lamproite to phlogopite and olivine-rich tuffs. The chemistry of the mantle xenolith was used...

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the biotite series is represented by variable amounts of the endmembers phlogopite, siderophyllite, annite, and eastonite. In contrast, a mineral group is...

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serpentinite body. In Japan, the mineral occurs in a magnesio-riebeckite-quartz-phlogopite-albite dike cutting a serpentinite body. Blue benitoite crystals on white...

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Fe)3(AlSi3)O10(OH)2 Fuchsite – K(Al,Cr)2(AlSi3)O10(OH)2 Muscovite – KAl2(AlSi3)O10(OH)2 Phlogopite – KMg3(AlSi3)O10(OH)2 Lepidolite – K(Li,Al) 2–3(AlSi 3)O 10(OH) 2 Margarite...

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Peridot Periclase Perthite Petalite (castorite) Pezzottaite Phenakite Phlogopite Phosgenite Phosphophyllite Phosphosiderite Piemontite Pietersite Plumbogummite...

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titaniferous magnetite, titanite, anatase, perovskite, baddeleyite, phlogopite, clinochlore and kassite. Warr, L.N. (2021). "IMA–CNMNC approved mineral...

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Comoro Islands

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mica (biotite or phlogopite). Glimmerite has also been referred to as biotitite, though the use of this term to describe phlogopite-rich rocks has been...

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member of the biotite mica group, the iron rich analogue of magnesium rich phlogopite. Annite is monoclinic and contains tabular crystals and cleavage fragments...

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Muscovite Nanpingite Norrishite Orlovite Oxyphlogopite Paragonite Phengite Phlogopite Polylithionite Preiswerkite Roscoelite Siderophyllite Suhailite Tainiolite...

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