Stable Mineral Assemblages of Igneous Rocks

A Method of Calculation

  • Alfred Rittmann

Part of the Minerals, Rocks and Inorganic Materials book series (MINERALS, volume 7)

Table of contents

  1. Front Matter
    Pages n1-XIV
  2. Alfred Rittmann
    Pages 1-13
  3. Alfred Rittmann
    Pages 14-21
  4. Alfred Rittmann
    Pages 22-34
  5. Alfred Rittmann
    Pages 35-59
  6. Alfred Rittmann
    Pages 60-69
  7. Alfred Rittmann
    Pages 70-73
  8. Alfred Rittmann
    Pages 88-139
  9. Alfred Rittmann
    Pages 140-181
  10. Alfred Rittmann
    Pages 182-204
  11. Wolfgang Hewers, Rudolf Stengelin
    Pages 217-223
  12. Hans Pichler, Rudolf Stengelin
    Pages 225-247
  13. Back Matter
    Pages 249-264

About this book


This book represents the results of a lengthy study which Professor ALFRED RITTMANN began some thirty years ago. The relationship between the chemical and mineralogical composition of igneous rocks is established as far as is possible. Petrographers will appreciate that this problem is extremely complex, particularly since this relationship forms the basis of the classification and nomenclature of igneous rocks. The ingenious scheme of calculation of the CI.P.W. norm system is essentially chemical in nature. The compositions of the stoichiometrically ideal "normative minerals" do not correspond to those of the constituent minerals found in rocks. Although the "norm" is not intended to equal the "mode" or actual mineral composition of a rock, at least a qualitative agreement between the norm and the mode is desirable. For a number of rocks and rock groups, especially the leucocratic and silicic rocks, the deviation of the norm from the mode is generally within tolerable limits. For the melanocratic and highly subsilicic rocks, on the other hand, the CI.P. W. scheme of calculation too often yields results which fail to reflect the observed mineral composition. The anomalies produced in the cal­ culation of extremely subsilicic volcanic rocks have recently been briefly discussed by F. CHAVES and H. S. YODER, JR. (1971).


Gestein Vulkangestein classification evolution igneous rock mineral petrography volcanic rock

Authors and affiliations

  • Alfred Rittmann
    • 1
  1. 1.Istituto Internazionale di VulcanologiaCataniaItaly

Bibliographic information

  • DOI
  • Copyright Information Springer-Verlag Berlin Heidelberg 1973
  • Publisher Name Springer, Berlin, Heidelberg
  • eBook Packages Springer Book Archive
  • Print ISBN 978-3-642-65484-8
  • Online ISBN 978-3-642-65482-4
  • Series Print ISSN 0343-2181
  • Buy this book on publisher's site