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lueshite

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Journal Article
Published: 01 December 1998
Mineralogical Magazine (1998) 62 (6): 769–782.
...A. R. Chakhmouradian; R. H. Mitchell Abstract Apatite-dolomite carbonatite at Lesnaya Varaka. Kola Peninsula, Russia, hosts intricate mineral intergrowths composed of lueshite in the core and pyrochlore-group minerals in the rim. Lueshite is a primary Nb-bearing phase in the carbonatite and ranges...
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Perovskite-group minerals from murmanite lujavrites (BSE images). (a) Pseud...
Published: 01 July 2002
Fig. 7. Perovskite-group minerals from murmanite lujavrites (BSE images). (a) Pseudoporphyritic texture defined by the presence of oikocrysts of murmanite (Mur), lamprophyllite (Lam) and lueshite (white grains indicated by arrows), Mt. Karnasurt; (b) detail of (a), note chadacrysts of aegirine
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SEM images of (A) a <span class="search-highlight">lueshite</span> twin and a pyrochlore penetration twin on natr...
Published: 01 November 2018
Fig. 2. SEM images of (A) a lueshite twin and a pyrochlore penetration twin on natrolite, (B) small octahedra of pyrochlore and needles of fersmite on hydroxylgugiaite, (C) a fersmite group mineral on chiavennite, and (D) peterandresenite on chiavennite. (A) and (B) are from the Ilímaussaq
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Scanning electron micrograph of euhedral crystals of <span class="search-highlight">lueshite</span> perched on ae...
Published: 01 June 2017
Fig. 15. Scanning electron micrograph of euhedral crystals of lueshite perched on aegirine from the St. Amable sill, Varennes Québec.
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Two distinctly zoned NaNbO 3  (<span class="search-highlight">lueshite</span> or natroniobite) crystals (a) with ...
Published: 31 May 2017
Fig. 9 Two distinctly zoned NaNbO 3 (lueshite or natroniobite) crystals (a) with crystals of britholite-(Ce) (b); Taseq locality.
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Petrographic and mineralogical characteristics of the pyrochlore- and luesh...
Published: 01 July 2002
Table 1. Petrographic and mineralogical characteristics of the pyrochlore- and lueshite-bearing samples from Lovozero.
Journal Article
Published: 01 August 2008
The Canadian Mineralogist (2008) 46 (4): 981–990.
... (isostructural avec le pyrochlore) cristallise. En revanche, nos données antérieures avaient démontré que la lueshite (structure de la pérovskite) cristallise dans le système CaCO 3 – Ca(OH) 2 – NaNbO 3 à teneurs élevées en NaNbO 3 . L’addition de 1.75% de fluor (poids) au système étudié diminue le...
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Journal Article
Published: 01 October 2007
The Canadian Mineralogist (2007) 45 (5): 1281–1292.
.... Associated minerals include aegirine, albite, erdite, eudialyte-group minerals, galena, langite, lueshite, lovozerite-group minerals, molybdenite, posnjakite, rasvumite, sérandite, sazhinite-(Ce), sphalerite, terskite, ussingite, villiaumite, wurtzite and a number of unknown minerals, including several Cu 2...
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Journal Article
Published: 01 July 2007
European Journal of Mineralogy (2007) 19 (4): 533–546.
... of “loparite-(Ce)” from the tawite comprise {100} growth sectors composed of loparite-(Ce) and {111} sectors composed of lueshite; the proportion of Na 0.5 Ce 0.5 TiO 3 and NaNbO 3 components varies by ≥15 mol.% between the sectors. In addition to the light rare-earth elements and Ti, the {100} sectors...
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Series: The Mineralogical Society Series
Published: 01 January 2004
DOI: 10.1180/MSS.10.07
EISBN: 9780903056496
... carbonatites are of hydrothermal-metasomatic origin. The sequence of carbonatite formation at Sallanlatvi may be interpreted as produced by fractional crystallization of a hydrous carbonatite magma. The presence of lueshite, as well as burbankite, shortite, eitelite and bradleyite as daughter minerals in fluid...
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Journal Article
Published: 01 October 2002
The Canadian Mineralogist (2002) 40 (5): 1347–1374.
... and rimmed by sodic–calcic amphiboles, representing products of re-equilibration with a Na-rich carbothermal fluid. The fluid fractionated from the carbonatitic source was also enriched in REE , Nb and Th, as indicated by the replacement of early perovskite by loparite-(Ce) and ceroan lueshite. Separation...
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Journal Article
Published: 01 July 2002
European Journal of Mineralogy (2002) 14 (4): 821–836.
...Fig. 7. Perovskite-group minerals from murmanite lujavrites (BSE images). (a) Pseudoporphyritic texture defined by the presence of oikocrysts of murmanite (Mur), lamprophyllite (Lam) and lueshite (white grains indicated by arrows), Mt. Karnasurt; (b) detail of (a), note chadacrysts of aegirine...
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Journal Article
Published: 01 August 2000
The Canadian Mineralogist (2000) 38 (4): 975–994.
... < 2 kbar, and over a wide range of a (Mg 2+ ) values. Perovskite from kimberlites approaches the ideal formula CaTiO 3 , and normally contains less than 7 mol.% of other end-members, primarily lueshite (NaNbO 3 ), loparite (Na 0.5 Ce 0.5 TiO 3 ), and CeFeO 3 . Evolutionary trends exhibited...
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Journal Article
Published: 01 October 1996
The Canadian Mineralogist (1996) 34 (5): 977–990.
...Roger H. Mitchell; Anton R. Chakhmouradian Perovskite-group minerals from the Lovozero peralkaline complex, on the Kola Peninsula, Russia, are primarily loparite-rich members of the perovskite-lueshite-loparite-(Ce) solid-solution series. From early-forming poikilitic nepheline syenite to late...
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Inter-sectorial variations in the contents of major cations across the lopa...
Published: 01 July 2007
Fig. 7. Inter-sectorial variations in the contents of major cations across the loparite-lueshite intergrowths from Mont Saint-Hilaire. Note high degree of correlation between the heterovalent substitutions in the A and B sites.
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Compositional relationships of naturally occurring loparite solid solution ...
Published: 01 September 2016
Figure 1 Compositional relationships of naturally occurring loparite solid solution in quaternary system perovskite-lueshite-tausonite-loparite (CaTiO 3 -NaNbO 3 -SrTiO 3 -Na 1/2 Ln 1/2 TiO 3 ) ( Ln = La, Ce, Pr, Nd).
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Anatomy of sector-zoned “loparite-(Ce)” crystals from Mont Saint-Hilaire. {...
Published: 01 July 2007
Fig. 4. Anatomy of sector-zoned “loparite-(Ce)” crystals from Mont Saint-Hilaire. {100} sectors (blue) show the preponderance of Na 0.5 LREE 0.5 TiO 3 component, whereas {111} sectors (purple) con tain a higher proportion of NaNbO 3 and, thus, should be termed lueshite.
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Compositions (mol. %) of perovskite II in the ternary system perovskite (Ca...
Published: 01 February 2001
F ig . 4. Compositions (mol. %) of perovskite II in the ternary system perovskite (CaTiO 3 )–lueshite (NaNbO 3 )–latrappite (CaFe 0.5 Nb 0.5 O 3 )–CeFeO 3 . Note that the CeFeO 3 component incorporates all end-members with the general formula LREE (Fe,Al)O 3 .
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Compositions (mol. %) of perovskite III in the ternary system perovskite (C...
Published: 01 February 2001
F ig . 5. Compositions (mol. %) of perovskite III in the ternary system perovskite (CaTiO 3 )–lueshite (NaNbO 3 )– loparite (Na 0.5 LREE 0.5 TiO 3 )–CeFeO 3 . Note that the CeFeO 3 component incorporates all end-members with the general formula LREE (Fe,Al)O 3 .
Journal Article
Published: 07 March 2022
Mineralogical Magazine (2022) 86 (2): 263–271.
... nepheline syenite from Kedykverpakhk Mt., Lovozero alkaline massif, Kola Peninsula, Russia. It occurs as anhedral grains up to 1 mm across and is associated with microcline–perthite, nepheline, sodalite, aegirine, lamprophyllite, lueshite, umbozerite, lomonosovite, nastrophite, a mineral of the kazakovite...
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