phlogopite

Also 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

Wikidata facts

Image: PhlogopiteMonteSommaIII.jpg

Show 8 more facts

Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 9.EC.20
Commons category: Phlogopite
Nickel-Strunz 9th edition (updated 2009): 9.EC.20
Mohs' hardness: 2.5
density: 2.815
IMA Mineral Symbol: Phl
chemical formula: KMg₃(Si₃Al)O₁₀(OH)₂
Strunz 8th edition (series ID, updated): VIII/E.05b

Sources (3)

via Wikidata · CC0

~4 min read

Article

8 sections

Contents

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.