Summary
Barylite has been identified for the first time in Greenland in several specimens from the nepheline syenite pegmatite pockets at Narssârssuk. The crystals are orthorhombic, showing the forms {100}, {210} and {201}, and form thin plates parallel to {100}. Electron microprobe analysis and emission spectrography show a composition close to the ideal formula. The refined unit cell paramters are:a=9.835(2) Å,b=11.654(3) Å andc=4.673(1) Å. The barylite is biaxial negative, 2V α=66o±2o,n α=1.694,n β= 1.697 andn γ calc.=1.698.
Zusammenfassung
Der seltene Barylith wurde zum ersten Mal in Grönland in verschiedenen Proben aus Nephelin-Syenit-Pegmatit-Drusen bei Narssârssuk identifiziert. Die Kristalle sind orthorhombisch mit den Formen {100}, {210} und {201}, sie bilden dünne Tafeln nach {100}. Elektronensonden-Analyse und Emissions-Spektrographie ergeben eine chemische Zussammensetzung, die der Idealform nahekommt. Die verfeinerten Zellparameter sind folgende:a=9,835(2) Å,b=11,654(3) Å undc=4,673(1) Å. Barylith ist zweiachsig negativ, 2V α=66o±2o,n α=1,694,n β=1.697 undn γcalc.= 1,698.
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Petersen, O.V., Johnsen, O. First occurrence of the rare mineral Barylite in Greenland. TMPM Tschermaks Petr. Mitt. 27, 35–39 (1980). https://doi.org/10.1007/BF01081861
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DOI: https://doi.org/10.1007/BF01081861