Fluorotremolite, vanadian
Campolungo, Leventina, Centovalli, Ticino, Switzerland
 
Flat prismatic fluorotremolite (7 mm on edge), coloured light green by vanadium, in sugary dolomite marble. A mineral classic from Ticino! EDX-analyzed specimen, found in October 2016 on the north side of the Venett Pass, ex Stefan Weiß collection. Strong green-yellow fluorescence in short-wave UV light!