...André-Mathieu Fransolet; François Fontan; Philippe de Parseval Abstract Two samples of “natromontebrasite”, among which a fragment of the type material, were re-investigated by X-ray-diffraction techniques and chemically analyzed. The X-ray powder-diffraction patterns clearly show the presence...

... mineral natromontebrasite NaAl(PO 4 )(OH,F) is reported from the Daheim pegmatite. In the Okatjimukuju pegmatite, montebrasite has been replaced by a number of phases including crandallite CaAl 3 (PO 4 ) 2 (OH) 5 ·H 2 O and brazilianite NaAl 3 (PO 4 ) 2 (OH) 4 . In one example, montebrasite has been...

... objections, and substituted for it fremontite (Schaller, 1914, 1916). In the amblygonite group, (Li,Na)AlP0 4 (F,OH), the now generally accepted nomenclature is: F > O H O H > F L i > N a amblygonite montebrasite N a > L i ( not known) natromontebrasite * Contribution No. 195 from...

... as “natromontebrasite,” (Na,Li)Al(PO 4 )(OH,F) and indicated that it comprises a mixture of OH-rich amblygonite and lacroixite with subordinate amounts of wardite ( Fransolet 1989 ; Fransolet et al. 2007 ). Groat et al. (1990) refined the crystal structure of the amblygonite–montebrasite series using a C -centered...

... and low-F montebrasite – “natromontebrasite” (now discredited; Fransolet et al. 2007 ) – fluorapatite → brazilianite → crandallite + goyazite + gorceixite – hydroxylapatite + muscovite. Some minerals of this assemblage, such as goyazite–crandallite, are not specific to granitic pegmatites because...

..., 307–315. A-M. Fransolet, F. Fontan, P. de Parseval (2007) Natromontebrasite, a discredited mineral species. Can. Min., 45, 391–396. Natromontebrasite, (Na,Li)AlPO 4 (OH,F), has been shown, by X-diffraction and electron microprobe to be a mixture of an OH-rich amblygonite and lacroixite...

... (arrojadite or dickinsonite), followed by suffixes. The species name sigismundite is replaced by the name arrojadite-(BaFe). IMA No. 05–E The species and name natromontebrasite are discredited because natromontebrasite is a mixture of OH-rich amblygonite with lacroixite and subordinate wardite...

... , J.R. , Hill , P.G. , von Knorring , O. & Oliver , G.J.H. ( 2000 ): Exotic aluminium phosphates, natromontebrasite, brazilianite, goyazite, gorceixite and crandallite from rare-element pegmatites in Namibia . Mineral. Mag . 64 , 1147 – 1164 . Baron , D. & Palmer...

... framework topology is common to many minerals, including arsenates (durangite, tilasite), germanates, phosphates (isokite, lacroixite, natromontebrasite, panasqueiraite, tavorite), selenates, silicates (malayaite, titanite), and sulfates (dwornikite, gunningite, kieserite, poitevinite, szmikite...

... overlying Barnwell Group. REFERENCES Baldwin , J.R. , Hill , P.G. , von Knorring , O. and Oliver , G.J.H. ( 2000 ) Exotic aluminium phosphates, natromontebrasite, brazilianite, goyazite, gorceixite and crandallite from rare-element pegmatites in Namibia . Mineralogical Magazine...

.... Parseval P. D. ( 2007 ): Natromontebrasite, a discredited mineral species . Can. Mineral. , 45 , 391 – 396 . Frost B. Barnes C. Collins W. Arculus R. Ellis D. Frost C. ( 2001 ): A geochemical classification for granitic rocks . J. Petrol. , 42 , 2033 – 2048...

... Štúr , Bratislava, Slovak Republic . Baldwin , J.R. , Hill , P.G. , von Knorring , O. & Oliver , G.J.H. ( 2000 ): Exotic aluminium phosphates natromontebrasite, brazilianite, goyazite, gorceixite and crandallite from rare-element pegmatites in Namibia . Mineral. Mag . 64...

... * [Al(PO 4 )F] C 1̅ 36c,d Montebrasite [Al(PO 4 )(OH)] C 1̅ 36c,d Natromontebrasite [Al(PO 4 )(OH)] – 36c,d Tavorite [Fe 3+ (PO 4 )(OH)] – 36c,d Cyrilovite [Fe 3+ 3 (PO 4 ) 2 (OH) 4 ] P 4 1 2 1 2 37a,b Wardite* [Al 3 (PO 4 ) 2 (OH) 4 ] P 4 1 2 1 2 37a,b...