Quartz
Choëx-Massongex quarry, Massongex, Saint-Maurice, Valais, Switzerland
Interesting 'Fensterquartz' specimen.
Collection Museé des Sciences de la Terre, Martigny.
Uploaded with permission from the Museé des Sciences de la Terre, Martigny, Switzerland.
Photo Peter Lof, Martigny, August 2015.
© Peter Lof