Crystallization and Melting of Diopside - Anorthite

Dexter Perkins
University of North Dakota
Author Profile


This short exercise introduces students to the binary phase diagram in the diopside-anorthite system that contains a eutectic invariant point.

Used this activity? Share your experiences and modifications



This exercise is designed for a mid/upper-level undergraduate geology course on the principles of mineralogy.

Skills and concepts that students must have mastered

Students should have knowledge of basic chemistry and of minerals equivalent to what they would learn in an introductory geology class.

How the activity is situated in the course

This activity is the 13th of 36 mineralogy exercises and is used towards the beginning of the course.


Content/concepts goals for this activity

  • Learn more about phase diagrams.
  • Learn about eutectics and peritectics.

Higher order thinking skills goals for this activity

  • Learn how to translate a phase diagram into something meaningful.

Other skills goals for this activity

Description of the activity/assignment

This short exercise introduces students to phase diagrams that have a eutectic and a peritectic. After learning about such phase diagrams, students answer questions about melt composition, temperature, cooling and melting, crystalization, and melt:crystal ratios.

Determining whether students have met the goals

More information about assessment tools and techniques.

Teaching materials and tips

Other Materials

Supporting references/URLs