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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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References

Anderson, (B. W.), Claringbull, (G. F.), Davis, (R. J.), and Hill, (D. K.), 1961. Nature, 190, 997.CrossRefGoogle Scholar
Chao, (G. Y.), Harris, (D. C.), Hounslow, (A. W.), Mandarino, (J. A.), and Perrault, (G.), 1967. Canad. Min. 9, 109-23.Google Scholar
[Ginzburg, (I. V.), Semenov, (E. I.), Leonova, (L. L.), Sidorenko, (G. A.), and Dusmatov, (V. D.)] ГиHзбyρr (И. B.), Cemehob (E. И.), ɅeoHoBa (Ʌ. Ʌ.), CидoρeHкo (Г. A.), и ДycMaTOB (B. Д) 1965. [Tρyды MИH. Myз. aкaд. Hayк CCCρ, 16, 57-72], cited by Perrault (G.) and Richard (P.), 1973. Canad. Min. 11, 922.Google Scholar
GüBelin, (E. J.), 1961. Gems and Gemology, 10, 163-79.Google Scholar
GüBelin, (E. J.), 1962. Gemmologist, 31, 142-52 and 165-9.Google Scholar
Mokeyeva (≈ Mokeeva), (V. I.) and Golovastikov, (N. I.) [MoкeeBa (B. И.) R (H. H.)], 1966. Dokl. Akad. Nauk S.S.S.R. 167, 106-8. transl, of Дoкʌ. aкaд. Hayк CCCρ, 167, 1131-4.Google Scholar
Perrault, (G.) and Richard, (P.), 1973. Canad. Min. 11, 913-29.Google Scholar
[Povarennykh, (A. S.) and Dusmatov, (V. D.)] ПoBaρeHHыx (A. C.) и Дycmatob (B. Д.), 1970. [КoHCTиTyчия и CBOйCTBa MиHeρaʌOB. КиeB. no. 4, CTρp. 7], cited in Min. Mag. 39, 916 (1974).Google Scholar
Richard, (P.) and Perrault, (G.), 1972. Acta Cryst. B28, 1994-9.CrossRefGoogle Scholar