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Köfels, Umhausen, Ötz valley, North Tyrol, Tyrol, Austria
Köfels, Umhausen, Ötztal, Nordtirol, Tirol, ÖsterreichLandslide (8000 years ago), with ductile deformation at very high strain rate in a narrow shear zone: intense friction raised temperature to melting, leading to the formation of a pumiceous glass thin layer.
The glass resulted from friction thermometamorphism of biotite-amphibole gneisses and not from volcanism or shock.
References
- Eur. J. Mineral., 1993, 5, 893-902.Mineral List
| 'Glass' | Lechatelierite | 'Pumice' | Quartz |
4 entries listed. 1 valid mineral.
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