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Harmotome from the Tokatoka district, New Zealand

Published online by Cambridge University Press:  05 July 2018

Philippa M. Black
Philippa M. Black*
Affiliation:
Department of Mineral Sciences, Smithsonian Institution, Washington, D.C. 20560, U.S.A.
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Summary

Harmotome, associated with analcime, is described from andesite dykes at Rehia and Maungarahu in the Tokatoka district, New Zealand. The Maungarahu harmotome has the composition: (Na1·03K0·23)(Ba1·54Ca0·18)Al4·66Si11·31 12·39 H2O; physical properties: α 1·498, β 1·503, γ 1·506, 2Vγ 75–82° β:[001] 28° D 2·378; and cell constants: a 9· 906±0·006, b 14·119 ±0·003, c 8·712±0·007 Å, β 124° 57′ ± 3′. The harmotome is Ba-poor, and 2 Na+ has substituted for Ba2+ on a valency basis. Analcime associated with the Maungarahu harmotome has chemical composition: (Na15·16 K0·03Ca0·09)Al15·52Si32·47 15·93 H2O and physical properties: n = 1·483, D = 2·257, a = 13·708 Å. The zeolites are believed to have crystallized from Na and Ba-rich alkaline solutions at approximately 200°C The source of the Ba is baryte concretions in adjacent limestones.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 288 , December 1969 , pp. 453 - 458
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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References

Barrer, (R. M.), Bultitude, (F. W.), and Kerr, (I. S.), 1959. Journ. Chem. Soc. Lond. 294, 1521.CrossRefGoogle Scholar
Black, (P. M.), 1964. Unpublished M.Sc. Thesis: Auckland University.Google Scholar
Black, (P. M.), 1967. New Zealand Journ. Geol. Geophys. 10, 903.CrossRefGoogle Scholar
Černý, (P.), 1960. Acta Akad. Sci. Cechoslov. Basis Brunensis, 32, op. 399, I.Google Scholar
Černý, (P.), 1964. Neues Jahrb. Min., Monatsh. 129.Google Scholar
Černý, (P.) and Povondra, (P.), 1965. Acta Univ. Carol., set. geol. 1, 31.Google Scholar
Coombs, (D. S.) and Whetten, (J. Z.), 1967. Bull. Geol. Soc. Amer. 78, 269.CrossRefGoogle Scholar
Ellis, (A. J.) and Mahon, (W. A. T.), 1964. Geochimica Acta, 28, 1323.CrossRefGoogle Scholar
Ferrar, (H. T.), 1934. New Zealand Geol. Surv. Bull. 34.Google Scholar
Holland, (H. D.), 1967. Geochemistry of Hydrothermal Ore Deposits, chap. 9. Edo H. L. Barnes, New York.Google Scholar
Hoss, (H.) and Roy, (R.), 1960. Beitr. Min. Petr. 7, 389.CrossRefGoogle Scholar
Mason, (B.), 1957. Amer. Min. 42, 379.Google Scholar
Morganstein, (M.), 1967. Sedimentology, 9, l05.Google Scholar
Sadanaga, (R.), Morumo, (F.), and Takeuchi, (Y.), 1961. Acta Cryst. 14, 1153.CrossRefGoogle Scholar
Sahama, (T. G.) and Lehtinen, (M.), 1967. Min. Mag. 36, 444.Google Scholar
Sekanina, (J.) and Wyart, (J.), 1937. Bull. Soc. franc. Min. 60, 139.Google Scholar
Taylor, (A. M.) and Roy, (R.), 1964. Amer. Min. 49, 656.Google Scholar