Phlogopite
A magnesium-rich trioctahedral mica mineral, often brown or reddish and common in some metamorphic and ultramafic rocks.
Language and route: German ← Ancient Greek. Breithaupt’s German Phlogopit employs Greek elements related to φλόξ ‘flame’ and ὤψ ‘face, appearance’, referring to reddish tints.
Literal gloss: flame-faced / fire-like appearance
The name and its history
August Breithaupt · 1841
- What does the word literally mean?
- The transmitted name is Breithaupt’s German Phlogopit employs Greek elements related to φλόξ ‘flame’ and ὤψ ‘face, appearance’, referring to reddish tints. The short gloss ‘flame-faced / fire-like appearance’ is a guide to the naming allusion, not by itself a modern mineralogical definition.
- What did the original author mean?
- Breithaupt introduced the name in 1841, alluding to the fiery colour of the specimens rather than to formation by a volcanic flame.
- Why was the name needed?
- The name singled out a distinct-looking mica at a time when many minerals were still recognised principally by visible properties.
- What evidence supported the original concept?
- Colour and crystal appearance supported recognition, later supplemented by precise Mg–Fe compositional criteria.
- How has geology changed the concept?
- Modern phlogopite is a recognised Mg-rich species in the mica hierarchy; its colour can differ from the originally flame-like specimens.
Further historical context
Breithaupt introduced the name in 1841, alluding to the fiery colour of the specimens rather than to formation by a volcanic flame.
The name singled out a distinct-looking mica at a time when many minerals were still recognised principally by visible properties.
Colour and crystal appearance supported recognition, later supplemented by precise Mg–Fe compositional criteria.
Modern phlogopite is a recognised Mg-rich species in the mica hierarchy; its colour can differ from the originally flame-like specimens.
Related names
Sources
- Mindat, Phlogopite — Breithaupt (1841) — Greek flame-faced allusion to original reddish specimen
- Rieder et al. (1998), Nomenclature of the micas — 1998 revision: biotite is no longer a species name
- Mindat, Mica Group — Historic appearance-based name and modern sheet-silicate group
- IMA–CNMNC, List of Mineral Names (updated September 2026) — Contemporary mineral-species standing; consult live master list