X-Ray and Optical Data for a Rare Earth–Poor Eudialyte from the North–Central Alaska Range

Abstract Powder X-ray and optical data have been recorded for a sample of exceptionally rare earth-poor eudialyte (Na 12 (Ca, REE) 6 (Fe 2+ ,Mn,Mg) 3 Zr 3 (Zr,Nb) x [Si 9 O 27−y (OH) y ] 2 [Si 3 O 9 ] 2 (C1,F) z , with x = 0. 1–0.9, y = 1–3 and z = 0.7–1.4) from a pegmatitic vein associated with the...

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Bibliographic Details
Published in:Powder Diffraction
Main Authors: Johnson, Neil E., Gunter, Mickey E., Solie, Diana N., Knowles, Charles R.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 1990
Subjects:
Condensed Matter Physics
Instrumentation
General Materials Science
Radiation
alaska range
Alaska
Online Access:http://dx.doi.org/10.1017/s0885715600015402
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0885715600015402
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Summary:Abstract Powder X-ray and optical data have been recorded for a sample of exceptionally rare earth-poor eudialyte (Na 12 (Ca, REE) 6 (Fe 2+ ,Mn,Mg) 3 Zr 3 (Zr,Nb) x [Si 9 O 27−y (OH) y ] 2 [Si 3 O 9 ] 2 (C1,F) z , with x = 0. 1–0.9, y = 1–3 and z = 0.7–1.4) from a pegmatitic vein associated with the peralkaline Windy Fork granite in the north–central Alaska range. The eudialyte is uniaxial positive with ω = 1.6062(2), ε = 1.6138 (3) and microprobe analyses indicate that the sum of REE + Yis less than 0.1 weight percent. Refined unit cell dimensions are: a = 14.2572(4), c = 30.1338(27), D x = 2.67, F 30 = 128 (0.006, 42), M 20 = 76. An indexed powder diffraction pattern is given.

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