Ternary System: Determination of crystal-liquid and crystal-crystal proportions using the Lever and Tangent Rules
R. K. Smith,
The University of Texas at San Antonio
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Students gain the experience of determining crystal-liquid and crystal-crystal proportions using the Lever and Tangent Rules in this simple ternary eutectic system.
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This exercise is designed for a sophomore or junior level required course in petrology.
Skills and concepts that students must have mastered
Students should be able to read ternary diagrams.
How the activity is situated in the course
This is a stand-alone exercise.
Content/concepts goals for this activity
The purpose of this exercise it to give students the experience of determining crystal-liquid and crystal-crystal proportions using the Lever and Tangent Rules in a simple ternary eutectic system.
Higher order thinking skills goals for this activity
Other skills goals for this activity
Description of the activity/assignment
This problem set uses the Lever and Tangent Riles in a simple ternary eutectic system to determine crystal-liquid and crystal-crystal properties.
Determining whether students have met the goals
Students have successfully completed the assignment if they answer the problems completely and accurately and show all work.More information about assessment tools and techniques.
Teaching materials and tips
- Activity Description/Assignment (Microsoft Word 24kB Jan7 04)
- Solution Set (Microsoft Word 36kB Jan7 04)