Graphical Representation of Metamorphic Mineral Parageneses

  • Helmut G. F. Winkler
Part of the Springer Study Edition book series (SSE)


Minerals composed of no more than three components may be represented within the plane of a triangle. As an example, wollastonite CaSiO3, grossularite Ca3Al2(SiO4)3, anorthite CaAl2Si2O8, sillimanite Al2SiO5, quartz SiO2, and corundum A12O3 consist of the three components CaO, Al2O3, and SiO2 in different proportions. Because of geometric advantages, compositions are most conveniently represented in an equilateral triangle [see Ferguson and Jones (1966)] . Each corner of the triangle represents a pure component, i.e., 100% CaO, 100% A12O3, and 100% SiO2. Each side allows the representation of a mixture and a mineral consisting of two components, while the interior of the triangle allows the representation of mixtures and minerals consisting of all three components.


Metamorphic Rock Mineral Assemblage Molecular Ratio Mafic Granulite Metamorphic Zone 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1979

Authors and Affiliations

  • Helmut G. F. Winkler
    • 1
  1. 1.Institute of Mineralogy and PetrologyUniversity of GöttingenFederal Republic of Germany

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