Western WA Univ GeologyAuthor Profile
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These movies show the indicatrix, a mineral, the principal indices of refraction, and the interference color predicted, all changing as the cut through the mineral varies. It is meant to be a lecture aid, or can be used as part of a problem set.
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Optical Mineralogy, Petrology, or Petrography for undergraduates.
Skills and concepts that students must have mastered
Should understand fast/slow rays and their relationship to the interference color chart.
How the activity is situated in the course
I use this as a lecture aid, but will likely design a problem set around it.
Content/concepts goals for this activity
Understand the interaction between light and crystals.
Higher order thinking skills goals for this activity
3-D visualization, using abstract models to understand observed phenomena
Other skills goals for this activity
Description of the activity/assignment
Determining whether students have met the goals
Teaching materials and tips
- Uniaxial Indicatrix Movie ( 6.1MB Jun21 10)
- Biaxial Indicatrix Movie ( 14.2MB Jun21 10)