Cordierite glass formed by shock in a cordierite-garnet-gneiss from the Ries crater, Germany
Abstract
A glass of cordierite composition was found in a highly shocked garnet gneiss collected from Otting quarry in the Ries crater. This glass varies in color from colorless to dark brown. Despite the variation in color no compositional variation from grain to grain was found. Electron microprobe analyses of several glasses revealed: SiO 2 49.07%, Al 2O 3 34.15%, FeO 6.07%, MgO 9.77%, CaO 0.07%, K 2O 0.11%, Na 2O 0.42%. In the sample investigated, all cordierite grains were transformed to isotropic cordierite glass.
- Publication:
-
Earth and Planetary Science Letters
- Pub Date:
- April 1973
- DOI:
- 10.1016/0012-821X(73)90094-0
- Bibcode:
- 1973E&PSL..18..385S