...Andreas Ertl; Gerald Giester; Thomas Ludwig; Hans-Peter Meyer; George R. Rossman Abstract Synthetic Al- and B-rich tourmaline crystals described by London (2011) were characterized further by SIMS and new EMP analyses. These tourmalines are the first synthetic B-rich olenites characterized...

.... Near the pyramidal faces, the composition of these tourmaline crystallites is relatively Al-rich (up to 43.6 wt% Al 2 O 3 ), and Mn-poor (0.1–0.3% MnO). A crystal-structure refinement of the Li-bearing olenite (near the pyramidal faces), in combination with analytical results, gives the optimized...

...Jan Cempírek; Milan Novák; Andreas Ertl; John M. Hughes; George R. Rossman; M. Darby Dyar Abstract The pale blue rim of olenite on a black crystal of olenite–schorl tourmaline from an abyssal pegmatite at the locality Kuklík, near Kutná Hora, Czech Republic, has been chemically and structurally...

...Andreas Ertl; Franz Pertlik; M. Darby Dyar; Stefan Prowatke; John M. Hughes; Thomas Ludwig; Heinz-Jürgen Bernhardt Abstract A sample of dark green Fe-rich (~7 wt% FeO total ) and Mn-bearing olenite from a beryl-bearing granitic pegmatite near Eibenstein, Lower Austria, was chemically...

... amounts of substitution of B for Si, five samples were separated from a core-to-rim (~3 mm) section of an Fe-bearing olenite with a dark green core and a nearly colorless rim from Koralpe, Austria. Crystal structures of the five samples were refined to R values <0.018 using three-dimensional X-ray...

... of tourmaline, and the O1 site is occupied by ~[O 0.9 (OH) 0.1 ]. Such samples of magnesian olenite provide a very good example of disorder driven by the short-range requirements of O 2− at the O1 site that is associated with the ~2Al + Mg configuration at the coordinating Y sites. To date, these tourmaline...

...Werner SCHREYER; John M. HUGHES; Heinz-Jürgen BERNHARDT; Angelika KALT; Stefan PROWATKE; Andreas ERTL Abstract Recent discoveries have demonstrated that some synthetic and natural olenite tourmalines contain less than the putative Si 6.00 p.f.u. , with the deficiencies in the tetrahedral sites...

...Bernd MARLER; Markus BOROWSKI; Ulrich WODARA; Werner SCHREYER Abstract Two excess-boron olenite samples which had been synthesized from a reaction mixture of 0.625 Na 2 O · 4.5 Al 2 O 3 · 6.0 SiO 2 · 3.0 B 2 O 3 + excess H 2 O at 600°C / 25 kbar (sample 1) and 650°C / 20 kbar (sample 2) were...

...Bernd Marler; Andreas Ertl Abstract Significant amounts of boron in both trigonal and tetrahedral coordination have been found through 11 B magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy of natural olenite (aluminum-rich tourmaline) from Stoffhütte, Koralpe, Styria...

... ](BO 3 ) 3 V 3 W) 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...

...John M. Hughes; Andreas Ertl; M. Darby Dyar; Edward S. Grew; Charles K. Shearer; Martin G. Yates; Charles V. Guidotti Abstract The substitution of [4] B for [4] Si in tourmaline has been the source of much discussion. A sample of olenite from Stoffhütte, Koralpe, Styria, Austria has been found...

...Werner SCHREYER; Ulrich WODARA; Bernd MARLER; Peter A. van AKEN; Friedrich SEIFERT; Jean-Louis ROBERT Abstract One selected composition within the system Na 2 O-Al 2 O 3 -B 2 O 3 -SiO 2 -H 2 O (NABSH) was studied with the aim of synthesizing the new tourmaline end member olenite...

... explanation. Using the example of olenitic tourmaline, we show that these features are likely explained by the occurrence of a precursor phase during tourmaline formation. Time-dependent piston–cylinder synthesis experiments were performed in the system SiO 2 –Al 2 O 3 –B 2 O 3 –NaCl–H 2 O at 700 °C/40 kbar...