『Abstract
　The ]Mineralogical Society of Great Britain & Ireland has published two full-colour posters describing the feldspar minerals, designed primarily for student use. They may be downloaded free of charge by all from www.minersoc.org/pages/education/edu.html and are designed to be printed at A3 size, although they are legible at A4 and in greyscale. Sheet 1 deals with nomenclature, crystal structure and phase relationships, while Sheet 2 covers phase behaviour. For brevity no sources are given on the posters, and these are provided in the present article, together with supporting notes and suggested reading on the more complex topics.』

Introduction
Specialized sources
Feldspars 1: nomenclature, structure and phase relationships
　1. Colour and turbidity
　2. Repeated fine-scale twinning
　3. Components and phases
　4. Nomenclature
　5. Crystal structure and symmetry
　6. Phase relationships for the Ab-Or join
　　(a) Solvus-solidus relationships
　　(b) Stable and metastable solvus curves
　　(c) Phase transitions
　7. Phase relationships for the Ab-An join
Feldspars 2: phase behaviour
　8. Ab-Or behaviour diagram
　9. Strain-controlled exsolution
　10. Replacement reactions and deuteric coarsening
　11. Ternary equilibria and geothermometry
　12. Twinning and phase transitions
　13. Twinning in anorthoclase and perthitic albite
　14. Twinning in microcline
　15. Twinning in plagioclase
References