... the rhombohedral structure found by Zachariasen (1951) for lanthanum oxyfluoride. The cubic cell dimensions found for cerium oxyfluoride are within the range of values reported by Finkelnburg and Stein (1950) who found that the cell constant of the fluorite-type structure varied with the amount of fluorine...

... SiO 2 26.73 26.59–26.85 0.07 Sanidine Total 99.28 S.D. – standard deviation Percleveite-(La) grains are chemically homogeneous and the WDS analyses reveal the uniform chemical composition with only minimal inter- REE chemical variation. Lanthanum significantly prevails...

... be named a ‘lanthanum anomaly’) at Mochalin Log is not in the scope of the present work. However, some local differences in distribution of individual lanthanides between coexisting minerals were observed and reflect the affinities of representatives of different structure types to La 3+ or REE 3...

... the southern Lancangjiang zone, SW China: Geochronological and geochemical constraints on their petrogenesis and tectonic implications : Lithos , v. 102 , p. 358 – 373 , https://doi.org/10.1016/j.lithos.2007.08.012 . Plank , T. , 2005 , Constraints from thorium/lanthanum on sediment recycling...

... and Meisser 2013 ), and Ponte dei Gonazzi, the Maritime Alps, Italy ( Cabella et al. 1999 ). In most cases, lanthanum is present in gasparite in subordinate amounts (<15 wt% La 2 O 3 ). However, La-dominant grains of gasparite were found in Mn-enriched metamorphosed rocks from the Ponte dei Gonazzi...

... , 18 ( 2 ), 109 – 117 . Plank , T. ( 2005 ) Constraints from thorium/lanthanum on sediment recycling at subduction zones and the evolution of the continents . Journal of Petrology , 46 ( 5 ), 921 – 944 . Plank , T. , and Langmuir , C.H. ( 1998 ) The chemical composition...