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Iraqite, a new rare-earth mineral of the ekanite group

Published online by Cambridge University Press:  05 July 2018

A. Livingstone ,
D. Atkin ,
D. Hutchison  and
H. M. Al-Hermezi
A. Livingstone
Affiliation:
Department of Geology, the Royal Scottish Museum, Edinburgh, EH1 1JF
D. Atkin
Affiliation:
Geochemical Division, Institute of Geological Sciences, 64/78 Gray's Inn Road, London WC1X 8NG
D. Hutchison
Affiliation:
Geochemical Division, Institute of Geological Sciences, 64/78 Gray's Inn Road, London WC1X 8NG
H. M. Al-Hermezi
Affiliation:
Nuclear Research Institute, Tuwaitha, Baghdad, Iraq
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Summary

Iraqite, a new mineral of the ekanite group from northern Iraq, has the composition (Ln1·33 Th0·66x0·15) (K1·07y0·93) (Ca3·49 Ln0·35 Na0·16) (Si15·69 Al0·27) (O39·93 F0·07) where x = U, Pb, Zr, Fe, Mg, and Cu, and y is presumed to be vacant sites. It occurs in granite in contact with dolomitic marble. The colour is pale greenish yellow; H 4½ Dcalc 3·28 and Dmeas 3·27 (Berman balance), both corrected for minor impurity and non-structural water. Optically it is uniaxially negative with ω 1·590 and ε 1·585 though some sections show anomalous extinction up to 7°. Space group is P4/mcc with a 7·61±0·01 and c 14·72±0·02 Å. Strongest lines of the indexed powder pattern are 5·28(100), 3·31(100), 2·64(100), 7·36(80), 3·38(80), 3·40(60), 2·7(40), 7·62(30). Thermal data are given.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 313 , March 1976 , pp. 441 - 445
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1976

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