Köfels, Umhausen, Ötz valley, North Tyrol, Tyrol, AustriaKöfels, Umhausen, Ötztal, Nordtirol, Tirol, Österreich
Landslide (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.
| 'Glass'|| Lechatelierite|| 'Pumice'|| Quartz|
4 entries listed. 1 valid mineral.
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Locality Updated: Woodsboro, Frederick Co., Maryland, USAFrom Bill Cordua, 13th Dec 2013 02:30:58