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

Published online by Cambridge University Press:  10 January 2013

Neil E. Johnson ,
Mickey E. Gunter ,
Diana N. Solie  and
Charles R. Knowles
Neil E. Johnson
Affiliation:
Department of Geological Sciences, Virginia Polytechnic Institute and StateUniversity, Blacksburg, Virginia 24061, U.S.A.
Mickey E. Gunter
Affiliation:
Department of Geology and Geological Engineering, University of Idaho, Moscow, Idaho 83843, U.S.A.
Diana N. Solie
Affiliation:
Alaska Division of Geological and Geophysical Surveys, 3700 Airport Way, Fairbanks, Alaska 99709, U.S.A.
Charles R. Knowles
Affiliation:
Department of Geology and Geological Engineering, University of Idaho, Moscow, Idaho 83843, U.S.A.
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Abstract

Powder X-ray and optical data have been recorded for a sample of exceptionally rare earth-poor eudialyte (Na12(Ca, REE)6(Fe2+,Mn,Mg)3Zr3(Zr,Nb)x[Si9O27−y(OH)y]2[Si3O9]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), Dx= 2.67, F30= 128 (0.006, 42), M20= 76. An indexed powder diffraction pattern is given.

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Type
Research Article
Information
Powder Diffraction , Volume 5 , Issue 2 , June 1990 , pp. 89 - 92
Copyright
Copyright © Cambridge University Press 1990

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