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LITHOEN

Mineral

Phlogopite

The magnesium end member of the series commonly called biotite, forming a solid solution with annite.

Classification

formula
KMg3(AlSi3O10)(OH)2
ima status
grandfathered
crystal system
monoclinic

How this record is known

1
Settled consensus
Cited as the accepted position of the discipline.

1 of 1 claims on this page cite at least one registered source. Counts describe how each statement is known, not how likely it is to be true.

What Lithoen records

Each claim states how it is known and cites its evidence.

EstablishedKMg3(AlSi3O10)(OH)2

Phlogopite is an accepted mineral species in the IMA List of Minerals, with the CNMNC-approved formula KMg3(AlSi3O10)(OH)2 and IMA status “grandfathered”.

  • definition basis: IMA List of Minerals, September 2026 update, which is the authority on mineral species status.
  • precision note: An approved formula is an idealised composition; natural crystals of most species depart from it through substitution.

Evidence support: Supported by the cited evidence one source

Evidence: Commission on New Minerals, Nomenclature and Classification, International Mineralogical Association 2026 Primary authority

In the knowledge graph

  • Phlogopite forms a solid solution with Annite
  • Phlogopite has essential constituent Hydrogen
  • Phlogopite has essential constituent Magnesium
  • Phlogopite member of Biotite
  • Phlogopite has essential constituent Potassium

Record last updated 2026-09-06. Corrections follow the published corrections policy; superseded claims are retained, never silently edited.