Phase Fun With Feldspars: Simple Experiments to Change Chemical Composition, State of Order, and Crystal System

Guy L. Hovis
,
Lafayette College
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Summary

Students will use X-ray diffraction to determine the composition of an "unknown" feldspar and then perform experiments to change the phase and composition of the feldspar.

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Context

Audience

This activity is designed for an undergraduate required course in mineralogy and is generally for sophomore or junior level students.

Skills and concepts that students must have mastered

How the activity is situated in the course

This activity is a stand-alone exercise, but is part of a larger volume of classroom and laboratory activities from "Teaching Mineralogy," a workbook published by the Mineralogical Society of America, Brady, J., Mogk, D. W., and Perkins, D., (editors), 1997,406 pp.

Goals

Content/concepts goals for this activity

Higher order thinking skills goals for this activity

Other skills goals for this activity

Description of the activity/assignment

Students will use X-ray diffraction to determine the composition of an "unknown" feldspar and then perform experiments to change the phase and composition of the feldspar.

Determining whether students have met the goals

Students have met the goals of this activity if they can correctly answer the questions embedded in the activity and demonstrate their ability to do the experiment and analyze their data.

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Other Materials

Supporting references/URLs

Brady, J., Mogk, D. W., and Perkins, D., (editors), 1997, Teaching Mineralogy, a workbook published by the Mineralogical Society of America, 406 pp.

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