Feldspar Chart – How to Read the Chart and Thin Section Identification
Today’s video is about how to read the feldspar chart, with the goal of being quick and easy to follow!
We talk a bit about solid solution and elemental substitutions that occur within the chart.
🔥 If you have any questions or video requests, just leave them in the comments!
👉 Link to the document with the Michel Lévy method:
https://drive.google.com/file/d/1YGip...
👉 Professor Heinrich Frank’s Channel:
/@heinrichfrank8083
⏱️ Timestamps:
0:05 – What is a solid solution?
0:28 – When does solid solution occur?
0:58 – Solid solution in plagioclases
1:11 – Substitution between calcium and sodium
1:24 – Substitution of silicon and aluminum
1:52 – Immiscibility gap
2:20 – Anorthite content and plagioclase classification
3:16 – Plagioclase in thin section: Michel-Lévy method
4:13 – Alkali feldspars: microcline in thin section