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First evidence of dmisteinbergite (CaAl2Si2O8 polymorph) in high-grade metamorphic rocks

  • Iris Wannhoff ORCID logo , Silvio Ferrero , Alessia Borghini , Robert Darling and Patrick J. O’Brien
Published/Copyright: December 1, 2022
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Abstract

We identified dmisteinbergite, the rare trigonal polymorph of CaAl2Si2O8, for the first time in high-grade metamorphic rocks. Dmisteinbergite occurs as a crystallization product of silicate melt inclusions (nanogranitoids) in garnet from three host rocks with different protoliths and re-equilibration conditions, i.e., from 1.0 to 4.5 GPa. Raman spectra and compositions of the dmisteinbergite here investigated are overall identical to those of previously characterized artificial and natural dmisteinbergite. In nanogranitoids, this phase coexists with other metastable polymorphs of feldspar (kumdykolite, kokchetavite) and SiO2 (quartz, cristobalite), recently interpreted as the result of undercooling, supersaturation and rapid crystallization of a silicate melt confined in a micrometric pore. Dmisteinbergite formation likely results from a similar process, and thus it should be regarded as a kinetically controlled phase. Moreover, the investigation of dmisteinbergite as well as of other metastable feldspar polymorphs offers new insights into the behavior of natural materials under non-equilibrium conditions.

Acknowledgments and Funding

The authors are grateful to C. Günter for assistance during analyses and to C. Fischer for sample preparation. We are thankful to S. Mittempergher and an anonymous reviewer for their thoughtful comments. This research was funded by the German Federal Ministry for Education and Research and by the Deutsche Forschungsgemeinschaft (Project FE 1527/2-3 and FE 1527/4-1 to S.F).

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Received: 2022-02-24
Accepted: 2022-07-27
Published Online: 2022-12-01
Published in Print: 2022-12-16

© 2022 Mineralogical Society of America

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