Anhydrite, Sulphur, Calcite
Simplon railway tunnel, Trasquera, Verbano-Cusio-Ossola Province, Piedmont, Italy
Aggregate of colourless to white flattened anhydrite crystals (the main one measures 58 mm in length) with sulphur and calcite.
Museo Regionale di Scienze Naturali [MRSN], Turin, cat. no. M/7920.
Photo by Gian Carlo Piccoli, published in Piccoli, G.C., Maletto, G., Bosio, P., and Lombardo, B. (2007) Minerali del Piemonte e della Valle d'Aosta. ...