Eur. J. Mineral. Open Access Article 2016, 28, 163–177 Special issue dedicated to Published online 7 October 2015 Thomas Armbruster Fluor-schorl, a new member of the tourmaline supergroup, and new data on schorl from the cotype localities 1,2, 1,2 3 4 5 ANDREAS ERTL *,UWE KOLITSCH ,M.DARBY DYAR ,HANS-PETER MEYER ,GEORGE R. ROSSMAN , 6 2 4 2 2 DARRELL J. HENRY ,MARKUS PREM ,THOMAS LUDWIG ,LUTZ NASDALA ,CHRISTIAN L. LENGAUER , 2 1 EKKEHART TILLMANNS and GERHARD NIEDERMAYR 1 Mineralogisch-Petrographische Abt., Naturhistorisches Museum, Burgring 7, 1010 Vienna, Austria *Corresponding author, e-mail:
[email protected] 2 Institut fu¨r Mineralogie und Kristallographie, Geozentrum, Universita¨t Wien, Althanstrasse 14, 1090 Vienna, Austria 3 Department of Geography and Geology, Mount Holyoke College, South Hadley, Massachusetts 01075, USA 4 Institut fu¨r Geowissenschaften, Universita¨t Heidelberg, Im Neuenheimer Feld 236, 69120 Heidelberg, Germany 5 Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125–2500, USA 6 Department of Geology and Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803, USA 2+ Abstract: Fluor-schorl, NaFe 3Al6Si6O18(BO3)3(OH)3F, is a new mineral species of the tourmaline supergroup from alluvial tin deposits near Steinberg, Zschorlau, Erzgebirge (Saxonian Ore Mountains), Saxony, Germany, and from pegmatites near Grasstein (area from Mittewald to Sachsenklemme), Trentino, South Tyrol, Italy. Fluor-schorl was formed as a pneumatolytic phase and in high-temperature hydrothermal veins in granitic pegmatites. Crystals are black (pale brownish to pale greyish-bluish, if ,0.3 mm in diameter) with a bluish-white streak.