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1 Mineralogisches Institut, Im Neuenheimer Feld 236, D-69120 Heidelberg, Germany
2 Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, D-44801 Bochum, Germany
3 Institut für Mineralogie und Kristallographie, Althanstrasse 14, A-1090 Wien, Austria
a now at: Institut de Géologie, Rue Emile-Argand 11 / CP 2, CH-2007 Neuchâtel, Switzerland, E-mail: angelika.kalt{at}unine.ch
At the margins of a plagioclase-quartz pegmatite near Stoffhütte (Koralpe, Austroalpine realm, Austrian Alps), a new solid solution series within the tourmaline group (XY3Z6[T6O18](BO3)3V3W) has been found, namely between magnesian schorl and lithian excess-boron olenite. At the pegmatite contact with mylonitic garnet-biotite schists, a tourmalinite band developed. Massive tourmaline cores are Mg-rich schorl with normal boron contents of 3.0 cations per formula unit that most likely formed by a reaction of melt with garnet. Within the pegmatite, only olenitic crystals were found. Within a transition zone, the Mg-rich schorl crystals become zoned and develop olenitic rims of increasing size, most likely formed from a fluid via the reaction plagioclase 
. The major compositional changes are decreasing Fe, Mg and Si contents and XMg values as well as increasing B, Al and Li contents. Over a distance of less than five centimetres, tourmaline composition determined by secondary ion microprobe (B, Li, Be, H) and electron microprobe (remaining elements, total Fe as Fe2+) varies continuously from 
. In contrast to the proton-deficient ideal olenite, the olenitic tourmaline from Stoffhütte contains 3.0–3.4 hydrogens per formula. The main substitutions are most likely 
, which is a modified Tschermaks' substitution, 
, 
. Coexisting muscovite and feldspar have considerable B (0.42–0.55 wt% and 71–134 ppm, respectively), Be (49–140 ppm and 79–169 ppm, respectively) and Li contents (6–9 ppm and 9–126 ppm, respectively). The apparent partition coefficient for total B between tourmaline and muscovite (DB =ctur/cms) varies between 6.5 and 16.8, but the values for tetrahedrally coordinated B (DB(T)) range from 0 to 13.0.
Key-words: schorl, olenite, excess boron, ion microprobe, Koralpe..
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