Published July 5, 2025 | Version v2
Software Open

QAPF (Streckeisen) diagram template for Excel

Authors/Creators

  • 1. KIT

Description

The template will plot modal compositional data of igneous rocks into QAPF and triangular diagrams, including diagrams for mafic and ultramafic rocks, according to the USGS nomenclature. The sample data can be arranged in up to 10 groups that will be displayed with different symbols/colours in the diagrams.

Version "QAPF_etc_2025-07.xlsm":

This version comes with a VBA macro that only inserts additional rows in order to accomodate more samples in a group. You don't need to enable the macro if you are happy with the number of pre-defined samples.

Notes

Tested with Excel 2019 for Mac and Windows.

Files

Files (1.3 MB)

Name Size Download all
md5:2eccf77d980ca54324124d69c953d997
1.3 MB Download

Additional details

References

  • A. Streckeisen (1976) Earth Sci. Rev. 12, 1–33
  • A. Streckeisen (1980) Geologische Rundschau 69, 194–207
  • R.W. Le Maitre (Ed.) Igneous Rocks – A Classification and Glossary of Terms, 2nd Edition, Cambridge University Press, Cambridge/UK