phlogopite
Sign in to saveAlso known as magnesium mica
Phlogopite is a yellow, greenish, or reddish-brown member of the mica family of phyllosilicates. It is also known as magnesium mica.
Key facts
- Mineral.name
- Phlogopite
- Mineral.category
- Phyllosilicate minerals
- Mineral.group
- Mica group, trioctahedral mica group, biotite subgroup
- Mineral.boxbgcolor
- afa362
- Mineral.boxtextcolor
- fff
- Mineral.image
- Phlogopite 3.JPG
- Mineral.imagesize
- 260px
- Mineral.formula
- KMg3(AlSi3O10)(F,OH)2
- Mineral.IMAsymbol
- Phl
- Mineral.strunz
- 9.EC.20
- Mineral.system
- Monoclinic
- Mineral.class
- Prismatic (2/m) (same H-M symbol)
- Mineral.symmetry
- C2/m
- Mineral.color
- Brown, brownish red, dark brown, yellow, yellowish brown, green, white and gray
- Mineral.habit
- Tabular, scaly masses, rarely perfect phenocryst tablets
- Mineral.twinning
- Composition twinning
- Mineral.cleavage
- Perfect basal (001)
- Mineral.fracture
- None
via Wikipedia infobox
~4 min read
Encyclopedic overview
8 sectionsContents
- Paragenesis
- Basaltic association
- Ultrapotassic association
- Ultramafic rocks
- Uses
- Miscellaneous
- References
- Further reading
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.
Excerpted from Wikipedia’s “phlogopite” article, available under the CC BY-SA 4.0 licence.