Integrating Research and Education > Crystallography > Clinopyroxene Phase Transition

An Examination of the Phase Transformation in Clinopyroxene

Robert Downs, University of Arizona

Introduction

There are several phases of pyroxene that display different symmetries. The most important include orthopyroxene, and clinopyroxene. In this exercise, we will examine the structures of 3 different clinopyroxene crystals as a function of cell volume in order to understand the mechanism behind their phase changes. Arlt and Armbruster (1997) and Arlt et al, (1998) reported the structure of kanoite, ideally MnMgSi2O6, as a function of pressure and temperature. We will make an animation that follows the volume changes of this pyroxene.

Information for instructors

Please see the Teaching Notes page.

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